Q1. The diagram shows a plane mirror used by a dentist to see the back of a patient s tooth.

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1 Year 0 Physics Waves Revision questions Higher Name: Q. The diagram shows a plane mirror used by a dentist to see the back of a patient s tooth. (a) Use a ruler to draw a ray of light on the diagram to show how the dentist is able to see the tooth labelled Z. (3) Describe the image formed by a plane mirror (Total 5 marks) Q2. (a) The diagrams show rays of light. Each ray strikes a surface of a glass block. On the diagram draw the path of each ray through the glass block and out into the air again. Page

2 Label another angle on the diagram which is equal to the angle marked X. Label this angle Y. (4) The diagrams show two beakers. Both beakers have a drawing pin inside as shown. The first beaker is empty. The eye cannot see the drawing pin. The second beaker is full of water and the eye can see the drawing pin. Explain how the eye is able to see the drawing pin in the second beaker. You may add to the diagram if it helps your answer (3) (Total 7 marks) Q3. Most young people can hear sounds in the frequency range 20 Hz to Hz. (a) Tick the box beside the statement which best describes frequency. the maximum disturbance caused by a wave the number of complete vibrations per second the distance between one crest of a wave and the next one the distance travelled by a wave in second () Page 2

3 Diagram X shows a trace on an oscilloscope screen. Draw a trace on diagram Y which has a higher frequency than that shown in diagram X. Draw a trace on diagram Z which has a larger amplitude than that shown in diagram X. (c) Choose words from the list below to complete the following sentences. higher louder lower quieter A musical note with a high frequency sounds... than one with a low frequency. A noise of small amplitude sounds... than one with large amplitude. (Total 5 marks) Q4. (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 Page 3

4 Satellites fitted with various telescopes orbit 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 2005 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 for the big bang theory. Describe the big bang theory. Suggest what scientists should do if new evidence were found that did not support the big bang theory. () (Total 8 marks) Page 4

5 Q5. (a) The new Tetra communications system to be used by the police transmits digital signals using microwaves of wavelength 75 cm. Use the following equation to calculate the frequency of the microwaves used by the Tetra system. Show clearly how you work out your answer. wave speed = frequency wavelength Frequency =... hertz Read the following extract from a newspaper and then answer the questions that follow. Residents of Stag Hill Court, a luxury block of flats, are shocked at the plans to site a mobile phone mast on the roof of the flats. They oppose the mast on health grounds, quoting research in Germany that has found a possible increase in cases of cancer around mobile phone masts. A spokesperson for the telecoms company said, The residents should not worry. The research carried out by our own scientists has found no link between ill health and mobile phone masts. This has not reassured the residents, who argue that new independent research is urgently needed. Explain why living near a mobile phone mast could cause ill health. (3) Suggest two reasons why the residents have not been reassured by the research carried out by the telecoms company (Total 7 marks) Page 5

6 Q6. Radio waves, ultra-violet, visible light and X-rays are all types of electromagnetic radiation. (a) Choose wavelengths from the list below to complete the table m 0 m m 500 m TYPE OF RADIATION WAVELENGTH (m) Radio waves Ultra-violet Visible light X-rays (4) Microwaves are another type of electromagnetic radiation. Calculate the frequency of microwaves of wavelength 3 cm. (The velocity of electromagnetic waves is 3 08 m/s.) (4) (Total 8 marks) Page 6

7 Mark scheme M. (a) ray drawn from tooth to mirror to eye angle I = angle R judged by eye at least one arrow in correct direction do not credit conflicting arrows if no ruler used maximum mark is 2 virtual upright M2. (a) Ignore arrows on rays perpendicular rays goes straight in and out other ray refracts towards normal (not along) emerges parallel incident ray (by sight) if refraction correct (ignore reflections) for mark each 3 [5] emergent angle marked Y if emerges parallel to right of normal for mark straight ray to water surface refracts/bends straight to eye/towards surface on right image correctly shown or states the same mark prose only of diagram incomplete any 3 for mark each M3. (a) number of complete vibrations per second for mark 3 [7] correct trace (more waves), ignore amplitude for mark correct trace (higher amplitude), ignore frequency for mark (c) higher for mark quieter for mark [5] Page 7

8 M4. (a) wavelength increases accept the crests are further apart ignore waves are further apart frequency decreases accept pitch decreases ignore references to amplitude stars / galaxies / sources emit all / different types of electromagnetic waves / radiation accept two or more named electromagnetic waves accept answers in terms of frequencies / wavelengths (c) wavelength (of light) increases accept frequency decreases or 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 for stars or it is moving away the fastest ignore reference to universe expanding (d) all matter compressed to / starts at / comes from a single point do not accept increasing gravitational pull accept everything / the universe for all matter (massive) explosion sends matter outwards accept explosion causes universe to expand ignore explosion creates the universe or further reference to star / Earth formation check validity / reliability of the evidence or change the theory to match the new evidence accept comparison of new and old evidence [8] Page 8

9 M5. (a) or correct equivalent allow mark for correct transformation and substitution (of 75) answer gains mark only 2 any mention of alpha, beta, gamma waves scores 0 marks emit / uses / transmit / receive microwaves accept radiation for microwaves throughout ignore radio waves some microwave / energy absorbed by / enters the body ecf for their given electromagnetic wave do not accept goes through the body raises temperature of (body) cells / tissue / water accept reference to water molecules vibrating faster accept it could cause mutation / harm / kill cells do not accept answers in terms of ionisation ignore references to cancer any two from: research (may be) biased or may have been misled in the past accept not independent or may be lying some research suggests a link long-term effect not proven / studied accept not studied for long enough residents may not have seen the research 2 [7] Page 9

10 M6. (a) radio 500 ultra violet visible X-rays Hz or 0 0 Hz OK for 4 marks for 3 marks for 2 marks or else 0 0 else /0.03 else v = frequency wavelength = 0.03xf or any answer with unit Hz scores, 2 or 3 for mark 4 [8] Page 0

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