# 8 20% Both types of bulb produce the same useful power output. Use the correct equation from the Physics Equations Sheet.

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1 Q. The table gives data about two types of low energy bulb. Type of bulb Power input in watts Efficiency Lifetime in hours Cost of one bulb Compact Fluescent Lamp (CFL) Light Emitting Diode (LED) 8 0% (a) Both types of bulb produce the same useful power output. (i) Calculate the useful power output of the CFL. Use the crect equation from the Physics Equations Sheet. Show clearly how you wk out your answer. Useful power output =... W Calculate the efficiency of the LED bulb. Use the crect equation from the Physics Equations Sheet. Show clearly how you wk out your answer. Efficiency =... () (b) Sketch and label a Sankey diagram f the CFL. Page of

2 (c) LED bulbs are expensive. This is because of the large number of individual electronic LED chips needed to produce sufficient light from each bulb. (i) Use the data in the table to evaluate the cost-effectiveness of an LED bulb compared to a CFL. Scientists are developing brighter and me efficient LED chips than those currently used in LED bulbs. Suggest one benefit of developing brighter and me efficient LED chips. () (Total 8 marks) Q. A homeowner had a new gas boiler installed. (a) The following infmation is an extract from the infmation booklet supplied with the boiler. Fuel Natural Gas Water temperature 60 C Energy supplied to gas boiler 8.0 kj/s (8.0 kw) Efficiency 0.95 (i) Use the equation in the box to calculate the energy transferred each second by the gas boiler to the water inside the boiler. Show clearly how you wk out your answer. Energy transferred by the gas boiler each second =... kj Page of

3 The energy value of the gas used in a home is measured in kilowatt-hours (kwh). The homeowner has a pre-payment meter and pays 30 into his account. With a pre-payment meter, gas costs 5p per kilowatt-hour. Use the equations in the box to calculate the total number of hours that the gas boiler would operate f 30. energy transferred = power time total cost = number of kilowatt-hours cost per kilowatt-hour Show clearly how you wk out your answer. Number of hours =... (b) Although the gas boiler is very efficient, some energy is wasted. Explain what happens to the waste energy. (Total 6 marks) Page 3 of

4 Q3. The diagram shows the apparatus that a student used to investigate the heating effect of different wavelengths of light. (a) (i) What process happens at the point labelled X on the diagram? () The student put thermometer D outside of the light spectrum. Suggest why. () (iii) The table gives the position and reading of each thermometer 0 minutes after the investigation started. Thermometer Position of thermometer Temperature in C A in violet light B in green light C in red light 4 D outside the spectrum 0 What should the student conclude from the data in the table? Page 4 of

5 (b) A similar investigation completed in 800 by the scientist Sir William Herschel led to the discovery of infrared radiation. Suggest how the student could show that the spectrum produced by the glass prism has an infrared region. (c) A person emits infrared radiation at a frequency of 3. x 0 3 Hz. Calculate the wavelength of the infrared radiation that a person emits. Take the speed of infrared radiation to be 3.0 x 0 8 m/s. Use the crect equation from the Physics Equations Sheet. Show clearly how you wk out your answer. Wavelength =... m (d) A thermal imaging camera detects infrared radiation. Electronic circuits inside the camera produce a visible image of the object emitting the infrared radiation. At night, police officers use thermal imaging cameras to track criminals running away from crime scenes. Thermal imaging cameras wk better at night than during the day. Explain why. (Total 0 marks) Page 5 of

6 Q4. The ship in the diagram is fitted with a navigation system. The navigation system wks out the location of the ship by timing the microwave signals transmitted from at least three satellites. (a) Microwaves are one type of electromagnetic wave. Give two properties that all electromagnetic waves have (b) The microwaves used in the navigation system are transmitted at a frequency of 575 MHz. Use the equation and infmation in the box to calculate the wavelength of the microwaves used in the navigation system. wave speed = frequency wavelength microwaves travel at m/s MHz = Hz Show clearly how you wk out your answer. Wavelength =... m (3) Page 6 of

7 (c) The ship is fitted with a metal aerial that receives the microwave signals from the satellites. F the navigation system to wk, what effect must the microwave signals have on the aerial? () (Total 6 marks) Q5. The diagram represents part of the electromagnetic spectrum. (i) Visible light travels through air at m/s. Why can we assume that radio waves travel through air at the same speed as light?... () A radio station broadcasts at a frequency of 00 khz. Use the following equation to calculate the wavelength of the waves broadcast by this radio station. Show clearly how you wk out your answer. wave speed = frequency wavelength Wavelength =. m (iii) Draw a vertical line on the diagram above to show the position of this radio wave in the electromagnetic spectrum. () (Total 4 marks) Page 7 of

8 Q6. All radio waves travel at m/s in air. (i) Give the equation that links the frequency, speed and wavelength of a wave.... () Calculate the wavelength, in metres, of a radio wave which is broadcast at a frequency of 909 khz. Show clearly how you wk out your answer Wavelength =... metres (Total 3 marks) Q7. (a) In 99, the astronomer Edwin Hubble observed that the light from galaxies that are moving away from the Earth showed a red-shift. What is red-shift? () Page 8 of

9 (b) By measuring the red-shift, Hubble was able to calculate the speed at which the galaxies are moving away from the Earth. He was also able to calculate the distance of these galaxies from the Earth. The graph shows some of the data calculated by Hubble. (i) The data from two galaxies, M and N, has been included in the graph. The light from galaxy M has a smaller red-shift than the light from galaxy N. What does the difference in red-shift tell scientists about the two galaxies, M and N? Page 9 of

10 The gradient of the line drawn on the graph gives a number known as the Hubble constant. The Hubble constant can be used to estimate when the universe began. Use the graph to calculate the value of the Hubble constant. Show clearly how you obtained your answer. Hubble constant =... km/s per megaparsec (iii) Me recently, data has been obtained from me distant galaxies. The results from the me recent data give a totally different value f the Hubble constant to the one calculated from the 99 data. Which set of data, the 99 the me recent, is most likely to give the value closest to the true value f the Hubble constant? Draw a ring around your answer. 99 me recent Give a reason f your answer. () Page 0 of

11 (c) The Andromeda galaxy is not moving away from the Earth. It is actually moving towards the Earth. This means that the light from Andromeda shows a blue-shift. How do the wavelength and frequency of the light from Andromeda seem to have changed when viewed from the Earth? (Total 8 marks) Q8. Red shift is one of the pieces of evidence which led scientists to propose the big bang they. (a) Describe the big bang they (b) To gain full marks f this question you should write your ideas in good English. Put them into a sensible der and use the crect scientific wds. Explain how red shift provides evidence f the big bang they (3) (Total 5 marks) Page of

12 Q9. (a) A student listens to the sound waves produced by a car siren. When the car is stationary, the student hears a constant frequency sound. Describe how the wavelength and frequency of the sound waves heard by the student change when the car is driven away from the student (b) Satellites fitted with various telescopes bit the Earth. These telescopes detect different types of electromagnetic radiation. Why are telescopes that detect different types of electromagnetic waves used to observe the Universe? () (c) In 005 a space telescope detected a star that exploded 3 billion years ago. The light from the star shows the biggest red-shift ever measured. (i) What is red-shift? () What does the measurement of its red-shift tell scientists about this star? () (d) Red-shift provides evidence f the big bang they. (i) Describe the big bang they Page of

13 Suggest what scientists should do if new evidence were found that did not suppt the big bang they () (Total 8 marks) Page 3 of

14 M. (a) (i).6 (W) allow mark f crect substitution ie (b) 3 (%) / 0.3 their (a)(i) 5 crectly calculated igne any units two output arrows one arrow should be wider judged by eye narrower arrow labelled light useful (energy / output / power) only sces if first mark awarded and wider arrow labelled waste (energy / output / power) accept heat igne numerical values (c) (i) any two from: comparison over same period of time of relative numbers of bulbs required eg over hours 5 CFL s required to LED accept an LED lasts 5 times longer link number of bulbs to cost eg 5 CFL s cheaper than LED an answer in terms of over a period of hours CFLs cost 5.50 (to buy), LED costs 9.85 (to buy) so CFLs are cheaper sces both marks an answer in terms of the cost per hour (of lifetime) being cheaper f CFL sces mark if then crectly calculated sces both marks over the same period of time LEDs cost less to operate (than CFLs) Page 4 of

15 any one from: price of LED bulbs will drop do not accept they become cheaper less electricity needs to be generated accept we will use less electricity less CO produced fewer chips needed (f each LED bulb) fewer bulbs required (f same brightness / light) less energy wasted do not accept electricity f energy [8] M. (a) (i) 7.6 allow mark f crect substitution and / transfmation ie (hours) allow mark f obtaining number of kwh = 00 an answer of 6(.3) gains both marks (b) any two from transferred to the surroundings / air / atmosphere becomes spread out shared between (many) molecules (wasted as) heat / sound [6] M3. (a) (i) refraction accept refracted reflection, diffraction and dispersion are increct Page 5 of

16 to check rise in temperature (of other thermometers) was due to the (different wavelengths of) light accept as a control / comparison to measure room temperature is insufficient (iii) any two from three: different colours produce different heating effects / (rises in) temperatures red light produces the greatest heating effect / (rise in) temperature violet produces the least heating effect / (rise in) temperature all colours produce a greater heating effect than outside the spectrum an answer the longer the wavelength the greater the (rise in) temperature the lower the frequency the greater the (rise in) temperature gains both marks (b) move a thermometer into the infrared region / just beyond the red light allow use an infrared camera / infrared sens the temperature increases beyond 4( C) accept temperature higher than f the red light (c) v = f λ accept accept allow mark f crect substitution ie = λ Page 6 of

17 (d) at night the surroundings are cooler accept at night the air is colder there is no heat from the Sun is insufficient at night there is a greater temperature difference between people and surroundings (so surroundings) emit less infrared (than in daytime) accept camera detects a greater contrast gives larger difference in infrared emitted (between people and surroundings) [0] M4. (a) any two from: travel at the same speed (through a vacuum) if a value is given it must be crect accept air f vacuum accept travel at the speed of light can travel through a vacuum / space do not accept air f vacuum transfer energy can be reflected can be refracted can be diffracted can be absbed transverse travel in straight lines accept any other property common to electromagnetic waves accept travel at the same speed through a vacuum f both marks both radiated from the Sun is insufficient Page 7 of

18 (b) 0.9 (0) accept any answer that rounds to 0.9 accept 0. f all 3 marks provided wking is shown 0. without wking gains marks allow marks f a crect substitution and transfmation using frequency in hertz ie wavelength = allow mark f changing MHz to Hz allow mark f crect substitution using 575 increctly converted frequency answers and gain marks 3 (c) create an alternating current with the same frequency (as the microwaves / signals / 575 (MHz)) igne reference to change in temperature [6] M5. (i) all electromagnetic waves travel at the same speed through a vacuum, (so assume same speed in air) accept all parts of spectrum f electromagnetic waves 500 (m) allow mark f crect transfmation and substitution allow mark f using Hz answers = mark (iii) line drawn at crect position anywhere between 000 and next section (0 000) accept their value f (a) drawn in the crect position [4] Page 8 of

19 M6. (i) speed = frequency wavelength accept the equation rearranged accept v s = f λ do not allow w f wavelength do not accept unless subsequent calculation crect 330 (m) allow mark f λ = = λ answer of (m) (m) [3] M7. (a) wavelength (of light appears to) increase accept frequency (appears to) decrease accept light moves to the red end of the spectrum do not accept it moves to the red end of the spectrum do not accept light becomes redder (b) (i) M is closer (to the Earth) than N M is moving (away from the Earth) slower than N 50 an answer between 50 and 530 inclusive gains mark Page 9 of

20 (iii) me recent no mark f this but must be given to gain reason mark (c) data me reliable accept data is me accurate improved equipment / techniques me technology is insufficient data obtained from me (distant) galaxies accept a wider range of data accept data closer to the line of best fit data less scattered accept no anomalous result(s) accept all data fits the pattern wavelength is decreased frequency is increased [8] M8. (a) any two from Universe started in one place (huge) explosion Universe is expanding do not accept big bang (b) Quality of written communication: Links needed between : galaxies, red shift, and distance / expansion any two from light from (galaxies) shifted towards red end of spectrum the further away the galaxy, the greater the red shift this shows that galaxies are moving away from us this suggests that Universe is expanding do not accept light from planets [5] Page 0 of

21 M9. (a) wavelength increases accept the crests are further apart igne waves are further apart frequency decreases accept pitch decreases igne references to amplitude (b) stars / galaxies / sources emit all / different types of electromagnetic waves / radiation accept two me named electromagnetic waves accept answers in terms of frequencies / wavelengths (c) (i) wavelength (of light) increases accept frequency decreases light moves to red end of spectrum accept redder but do not accept red alone it is the star (detected) furthest from the Earth accept galaxy f stars it is moving away the fastest igne reference to universe expanding (d) (i) all matter compressed to / starts at / comes from a single point do not accept increasing gravitational pull accept everything / the universe f all matter (massive) explosion sends matter outwards accept explosion causes universe to expand igne explosion creates the universe further reference to star / Earth fmation check validity / reliability of the evidence change the they to match the new evidence accept comparison of new and old evidence [8] Page of

22 Page of

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