# Edexcel Physics 1 Topic 1

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1. Name the theory that has the Sun in the middle of the Solar System
Heliocentric
2. Name the theory that has the Earth in the middle of the Solar System?
Geocentric
3. Which theory about the structure of the solar system is correct, the geocentric or heliocentric?
Heliocentric (sun in the middle)
4. What is the name of our galaxy?
• The Milky Way
5. What is a collection of stars called?
A galaxy
6. How did Galileos observation of Jupiter provide evidence for the heliocentric model of the solar system?
He saw that it had moons orbiting it. This proved that not everything orbited the Earth.

7. How can you measure the focal length of a lens using a distant object?
• Hold the lens in front of a screen (eg paper) and adjust it until an image is formed on the screen. The focal length is then the distance from the lens to the image.
8. What is a real image?
An image that can be projected (displayed) on a screen.
9. What is the opposite of a real image?
A virtual image
10. What is a virtual image?
An image that cannot be projected (displayed) on a screen.
11. What affects the magnification of a lens?
• The distance between the lens and the object.
• The shape of the lens - the more curved it is, the higher the magnification.
12. What are the names of the two lenses in a refracting telescope?
• Objective lens
• Eyepiece lens
13. What is refraction?
• When a wave (like light) hits the boundary between two different materials at an angle and it changes direction
14. What do waves transfer from one place to another?
Energy and information without transferring matter
15. What do we call the distance between two peaks of a wave?
• Wavelength
16. What do we call the number of cycles per second of a wave?
Frequency
17. What is the unit of frequency?
Hertz (Hz) - it means cycles per second
18. What is meant by the amplitude of a wave?
Amplitude is measured from the middle of a wave to the top of a peak
19. What are the two basic types of wave?
Longitudinal and transverse
20. Are sound waves longitudinal or transverse?
Longitudinal (the vibrations are in the direction of travel of the wave)
21. Are electromagnetic waves longitudinal or transverse?
Transverse (the vibrations are across the direction of travel of the wave)
22. Are seismic waves longitudinal or transverse?
They can be either transverse or longitudinal
23. Name some types of waves that telescopes can detect
• visible light
• infrared
• x-rays
• ultraviolet
• microwaves
24. Why are large telescopes better at viewing distant stars?
They can gather more light from the dim distant stars
25. What type of telescopes collect visible light and contain both lenses and mirrors?
Reflecting telescopes. (They use a mirror instead of an objective lens)
26. Who proved that the geocentric model was incorrect?
Galileo
27. What type of telescope is this?

Reflecting (as it contains mirrors)
28. Which is the largest - the Sun or the Milky Way?
• Milky Way
• (It is the name of our galaxy and contains the Sun and all the other millions of stars in our galaxy)
29. Why does the Hubble space telescope give us really good images of deep space?
• It is outside the Earth's atmosphere so the light (and other radiation) is not absorbed before it gets to the telescope.
• (NOT because it is closer)

30. What sort of telescope is this?
Refracting (as it only contains lenses)
 Author: HLHSscience ID: 199104 Card Set: Edexcel Physics 1 Topic 1 Updated: 2014-03-23 10:07:06 Tags: Edexcel Physics Topic1 Folders: Description: Visible light and the solar system Show Answers: