Vocabulary

Across

2. a mirror with a curved reflective surface
4. a sound or series of sounds caused by the reflection of sound waves from a surface back to the listener
6. the interference produced when two or more waves are not in phase and create a wave that is weaker then either of them
7. Invisible rays that are part of the energy that comes from the sun
8. the bending of light as it passes from one substance to another
9. allowing light, but not detailed images, to pass through; semitransparent.
12. part of the electromagnetic spectrum, between IR and UV, that is visible to the human eye
13. a wave that moves a medium in a direction paralell to the direction in which the wave travels
15. situated outside the visible spectrum at its red end —used of radiation having a wavelength between about 700 nanometers and 1 millimeter
16. the rate at which something occurs or is repeated over a particular period of time or in a given sample
17. Light with the shortest wavelengths and the highest energies and frequencies in the electromagnetic spectrum
18. Low part of a transverse wave
19. he throwing back by a body or surface of light, heat, or sound without absorbing it.
20. characteristic of a sound that is primarily a psychological connection of amplitude
22. The part of a longitudinal wave where the particles of the medium are close together and under high pressure
23. an electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication.
24. when light falls upon a plane surface it is so reflected that the angle of reflection is equal to the angle of incidence
25. a kind of radiation including visible light, radio waves, gamma rays, and X-rays
26. allowing light to pass through so that objects behind can be distinctly seen.
29. when light falls upon a surface it is so reflected that the angle of reflection is equal to the angle of incidence
32. waves that move the medium at right angles to the direction in which the waves travel
33. the SI unit of frequency
34. a unit used to measure the intensity of a sound
38. energy that is radiated or transmitted in the form of rays or waves or particles
39. an electromagnetic wave with a wavelength in the range 0.001–0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation.
40. an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other.

Down

1. a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.
2. the interference produced when two or more energy waves that are in phase
3. degree of highness or lowness of a tone
5. the highest part of a transverse wave
10. when something gets in the way of something else
11. a repeated back and forth or up and down motion
14. not able to be seen through; not transparent.
21. Rays of light that pass through the lens are spread out (they diverge). A convex lens is a diverging lens.
25. the range of wavelengths or frequencies over which electromagnetic radiation extends.
27. the max distance that particles of a medium move away from their rest positions as a wave passes trough a medium; this determines the amount of energy in a wave
28. an electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials opaque to light.
30. distance between two corresponding parts of a wave(crest to crest trough to trough)
31. a disturbance that transfers energy from place to place
34. the process by which a beam of light or other system of waves is spread out
35. waves that require a medium to travel through
36. the part of a longitudinal wave where the particles of the medium are far apart and under little pressure
37. something that a wave needs in order to travel