# Core Science Red Shift

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1 Core Science Red Shift Homework Name Redhill School Q1.(a) Scientists have observed that the wavelengths of the light from galaxies moving away from the Earth are longer than expected. What name is given to this observation? Draw a ring around the correct answer to complete each sentence. light can be stretched. This observation gives scientists evidence that galaxies are changing colour. the Universe is expanding. (iii) There is a pattern linking the size of the observed increase in the wavelengths of light from a galaxy and the distance the galaxy is from the Earth. Which one of the graphs, L, M or N, shows the correct pattern? Write the correct answer in the box. (b) Observations help scientists answer questions about the Universe. Scientists cannot answer every question. Which one of the following questions cannot be answered by scientists? Tick ( ) one box. Page 1

2 Redhill School How old is the Universe? Why was the Universe created? How fast does light travel through the Universe? (Total 4 marks) Q2.The diagram shows a teacher using a loudspeaker to demonstrate an important effect. The loudspeaker produces a note of constant frequency and is swung around in a circle. (a) As the loudspeaker moves towards the students, the frequency of the note heard by the students increases. What happens to the note heard by the students as the loudspeaker moves away from them? Page 2

3 (b) The teacher is using the demonstration to model the red-shift in light observed from most distant galaxies. Redhill School Which part of the demonstration: represents a moving galaxy? is like the red-shift? (2) Which one of the following statements gives the main reason why models are used in science? Put a tick ( ) in the box next to your answer. Models can help to explain an effect or theory. Models can prove that a theory is correct. Models can prove that a theory is wrong. (c) Red-shift provides evidence to support the theory that the Universe began from a very small initial point. What name is given to this theory?... (Total 5 marks) Q3.(a) Observation of the spectra from distant galaxies provides evidence to support the Big Bang theory. Complete the following sentence. Page 3

4 Many scientists think that the Big Bang theory describes the... Redhill School Tick ( ) one box to complete the sentence. The discovery of cosmic microwave background radiation was important because it... proved the Big Bang theory to be correct. provided more evidence to support the Big Bang theory. proved the Universe will continue to expand forever. (b) Many stars are part of a binary star system. Binary star systems have two stars. The visible spectrum from stars includes dark lines. These lines are at specific wavelengths. The diagram shows the position of two dark lines in the spectrum from the Sun. It also shows the same lines in the spectra from two stars A and B in a binary star system at the same point in time. Page 4

5 Redhill School What name is given to the effect shown in the spectrum from star A? Scientists have concluded that the two stars in a binary star system orbit around a fixed point between the two stars. A comparison of the spectra from the two stars in a binary star system provides evidence to support this conclusion. Explain how. (3) (Total 6 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 5

6 Redhill School (2) (b) 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 13 billion years ago. The light from the star shows the biggest red-shift ever measured. 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 (2) Suggest what scientists should do if new evidence were found that did not support the big bang theory (Total 8 mark) Page 6

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