1. M. Rahman P1 TOPIC 1 1) What is the difference between the heliocentric model of the world and geocentric model? Answer Heliocentric-sun centred Geocentric-earth cantered.

2. M. Rahman P1 TOPIC 1 2) Which is the accepted theory? a) Heliocentric b) Geocentric. Answer a) Heliocentric-sun centred

3. M. Rahman P1 TOPIC 1 3) Galileo proved the heliocentric model to be true by observing a) Jupiter's moon. b) Jupiter’s stars c) Saturn’s moon Answer a) Jupiter’s moon Bonus question What did he observe. Bonus question Jupiter’s moons were not going round the earth-disapproved the geocentric model.

4. M. Rahman P1 TOPIC 1 4) What are the three ways objects in space are observed? Answer a)Naked eye b) Telescope c) Photography

5. M. Rahman P1 TOPIC 1 5) How have telescope helped us to learn more about the universe? Answer. modern telescopes are more powerful/have greater magnification or positioned above Earth’s atmosphere/ on top of mountains (1). Different/more wave(length)s/frequencies (now) detected/collected (1) because telescopes positioned above Earth’s atmosphere or by radio telescopes (1) OR weaker signal(s) (now) detected/collected (1)

6. M. Rahman P1 TOPIC 1 6) How are photographs used to understand the universe? Answer Camera attached to a telescope and zoomed into photograph in detail. Easy to monitor objects over time by using time lapse photography (-images taken over a period of time and comparing them.)

7. M. Rahman P1 TOPIC 1 7) What is the wavelength of a wave? Answer Distance between one peak to the next

8. M. Rahman P1 TOPIC 1 8) What is the frequency of a wave? Answer How many complete waves there are per second. Bonus question What is the units of frequency. Bonus question Hertz (Hz)

9. M. Rahman P1 TOPIC 1 9) What is the amplitude of a wave? Answer Is the height of the peak from the midline.

10. M. Rahman P1 TOPIC 1 10) What is the difference between longitudinal wave and transverse waves? Answer. Transverse: The vibrations are 90 degrees to the direction of the travel of the wave. Longitudinal: The vibrations are along the same direction to the travel of the wave.

11. M. Rahman P1 TOPIC 1 11) Give three examples of transverse wave. Answer. Light (all electromagnetic waves) S-waves Ripples on water.

12. M. Rahman P1 TOPIC 1 12) Give two examples of longitudinal waves. Answer. Sound and ultrasound P-waves

13. M. Rahman P1 TOPIC 1 13) When waves hit a boundary between two materials two things can happen, what are they? Answer. Reflection Refraction

14. M. Rahman P1 TOPIC 1 14) When light enters from a less dense material into more dense material.. a)Changes direction towards the normal and speeds up. b)Changes direction towards the normal and slows down c) Changes direction away from the normal and slows down Answer b) Changes direction towards the normal and slows down

15. M. Rahman P1 TOPIC 1 15) What is the focal length of a lens? a)Distance between the object and the lens. b) Distance between the lens and where image is formed. c) Distance between the object and the image. Answer b) The distance between the lens and the image.

16. M. Rahman P1 TOPIC 1 16) A refracting telescope contains…. a) Two converging lens b) Two mirrors, and lens c) One mirror and a lens Answer a) Two converging lens.

17. M. Rahman P1 TOPIC 1 17) A reflecting telescope contains…. a) Two converging lens b) Two mirror and a lens c) One mirror and a lens Answer b) Two mirror and a lens.

18. M. Rahman P1 TOPIC 1 18) Name two similarities between a reflecting and refracting telescope. Answer Both have eye piece lens that magnifies the image. Both have an objective lens/ curved mirror that focuses the light. Real image is formed..

19. M. Rahman P1 TOPIC 1 19) Name two differences between a reflecting and refracting telescope. Answer A refractive telescope uses lens to collect light A reflective telescope uses mirrors to collect light A reflective telescope collects more light then refracting A reflective telescope is portable compared to a refractive.

20. M. Rahman P1 TOPIC 1 20) Why are telescopes based in space? Answer Avoids the earths atmosphere getting in the way. Avoid light pollution (street light)- makes it hard to pick up dim objects. Air pollution/dust; can reflect light coming from space

21. M. Rahman P1 TOPIC 1 21) Explain how a refracting telescope produces a magnified image of Jupiter. Answer the (objective) lens (1) collects light (from Jupiter) (1) focuses/converges/refracts the light (1) (objective) produces a real image (1) (at the) focal point (1) (Image is viewed by the) eyepiece lens (1) (Eyepiece) produces a virtual image (1)