# AQA Physics P1.5

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1. What are the two main categories of waves?
• transverse
• longitudinal
2. Which type of wave has oscillations perpendicular (at right angles) to the direction of energy transfer?
Transverse ( transverse means across)
3. Which type of wave has oscillations parallel to the direction of energy transfer?
Longitudinal
4. What do waves transfer from one place to another?
Energy
5. Are electromagnetic (EM) waves transverse or longitudinal?
Transverse
6. Are sound waves transverse or longitudinal?
Longitudinal
7. Are mechanical waves transverse or longitudinal?
They can be either
8. Which type of electromagnetic (EM) wave travels the fastest through a vacuum?
All EM waves travel at the same speed in a vacuum
9. Put these EM waves into the correct order (lowest frequency first)
gamma ray, x-ray,radio, infrared, visible, microwave, ultraviolet
• microwave
• infrared
• visible
• ultraviolet
• x-ray
• gamma ray
10. Is the energy of a wave proportional to its wavelength or its frequency
Frequency
11. What name is given to the area in a longitudinal wave where the particles have been moved apart?
Rarefaction
12. What name is given to the area in a longitudinal wave where the particles have been moved closer together?
Compression
13. What are the three wave phenomena?
• reflection
• refraction
• diffraction
14. What size does the gap or obstacle need to be if there is to be an appreciable amount of diffraction?
Similar to the wavelength of the wave
15. Where does refraction occur?
At the boundary (interface) between two materials
16. What is the change of direction of waves at an interface between two materials called?
Refraction
17. What does

represent in the wave equation

The wavelength of the wave
18. Which type of EM wave is used in TV remote controls?
Infrared
19. Which types of communication devices use microwaves?
Mobile telephones and satellite TV
20. When constructing ray diagrams, what is the normal?
• A line perpendicular (at right angles) to the reflecting (or refracting) surface at the point of incidence.
• (It is called a construction line as it is used in determining where to draw rays)
21. What is the relationship between the angle of incidence and the angle of reflection?
They are always equal
22. What 3 properties do images produced in a plane mirror have?
• virtual (cannot be projected onto a screen)
• upright
• laterally inverted (back to front horizontally)
23. What wave property does the pitch of sound relate to?
Frequency
24. What wave property does the loudness of sound relate to?
Amplitude
25. What are echoes?
Reflected sounds
26. If a wave source is moving towards an observer, what effect does it have on the observed frequency of the wave?
It increases (think of the peaks being pushed closer together)
27. When a wave source moves relative to an observer, the frequency and wavelength seem to change. What is this effect called?
The Doppler effect
28. What is Red Shift?
The phenomenon whereby light from distant galaxies is shifted towards the red end of the spectrum as they are moving away from us
29. Which is the only theory that can explain the existence of Cosmic Microwave Background Radiation (CMBR)
The Big Bang theory
30. What is the Big Bang theory?
A theory about the creation of the Universe that states the Universe began from a very small initial point.
 Author: BMH ID: 298326 Card Set: AQA Physics P1.5 Updated: 2015-03-13 18:04:33 Tags: AQA Physics P1 Folders: Description: AQA Physics P1.5 Show Answers: