Waves Unit.

Question 1

Frequency

Answer 1

the rate at which something occurs or is repeated over a particular period of time or in a given sample.

the rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second.

Question 2

Period

Answer 2

the interval of time between successive occurrences of the same state in an oscillatory or cyclic phenomenon, such as a mechanical vibration, an alternating current, a variable star, or an electromagnetic wave.

Question 3

Wavelength

Answer 3

the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

Question 4

Crest

Answer 4

the maximum value of upward displacement within a cycle. A crest is a point on a surface wave where the displacement of the medium is at a maximum.

Question 5

Trough

Answer 5

A trough is the opposite of a crest, so the minimum or lowest point in a cycle.

Question 6

Medium

Answer 6

A substance that makes possible the transfer of energy from one location to another, especially through waves.

Question 7

Amplitude

Answer 7

the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position.

Question 8

Longitudinal wave

Answer 8

A wave that oscillates back and forth on an axis that is the same as the axis along which the wave propagates.

Question 9

Electromagnetic spectrum

Answer 9

the range of wavelengths or frequencies over which electromagnetic radiation extends.

Question 10

Transverse wave

Answer 10

I way vibrating at the right angle to the direction of it propagation.

Question 11

Compression

Answer 11

A compression is a region in a longitudinal wave where the particles are closest together.

Question 12

Rarefaction

Answer 12

The region in a longitudinal wave where the particles are furthest apart.

Question 13

Reflection

Answer 13

Reflection is the change in direction of the wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

Question 14

Refraction

Answer 14

the change in direction of a wave passing from one medium to another caused by its change in speed.

Question 15

Diffraction

Answer 15

Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit.