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A Level Physics > Waves > Flashcards

Flashcards in Waves Deck (72)
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1

Described transverse wave.

A type of wave in which the particles oscillate perpendicular to the direction the wave travels.

2

Examples of transverse waves.

EM waves, water and s-waves.

3

Describe a longitudinal wave.

A type of wave in which the particles oscillate parallel to the direction of wave travel.

4

Examples of longitudinal waves.

Sound waves and p-waves.

5

What is the wavelength of a wave?

It is the distance between two matching points on neighbouring waves, measured in metres.

6

What is the amplitude of a wave?

Amplitude is the maximum displacement of a point from the centre of oscillation, measured in metres.

7

The larger the amplitude the greater the what of the wave?

The greater the energy of the wave.

8

The period of a wave, T, is what?

The time taken for a point on the wave to move through one complete oscillation.

9

Frequency of a wave is measured in what?

Hertz, Hz.

10

Equation linking time period and frequency of a wave:

f=1/T
Where:
f is frequency in Hz.
T is time period in s.

11

Frequency is a measure of what?

Number of waves that pass a point in 1 second.

12

The wave equation is:

v=fλ
Where:
v is velocity in ms^-1.
f is frequency in Hz.
λ is wavelength in m.

13

Electromagnetic waves are transverse, true or false?

True.

14

True or false, electromagnetic waves travel at different speeds?

False, they all travel at the same speed (speed of light).

15

What speed do electromagnetic waves travel through a vacuum at?

3x10^8ms^-1

16

Typical wavelength for a radiowave is what?

10^3m to a few metres.

17

Typical wavelength for a microwave is what?

10^-2m

18

Typical wavelength for an infrared wave is what?

10^-5m

19

Typical wavelength of visible light is what?

10^-7m

20

Typical wavelength of ultraviolet light is what?

10^-8m

21

Typical wavelength of X-ray radiation is what?

10^-10m

22

Typical wavelength of a gamma ray is what?

10^-12m

23

EM radiation travels by what?

Oscillations in both the electric and magnetic fields.

24

Superposition of waves is what?

Where the waves are both causing the same particle to oscillate causing the amplitudes to be summed.

25

If two waves of the same wavelength and amplitude are perfectly in phase, what can be said about the amplitude of the resultant wave?

It is twice the amplitude of one of the initial waves.

26

When waves cause a resultant wave with a greater amplitude than the initial waves what kind of interference is this?

Constructive interference.

27

When two waves have the same amplitude and wavelength but are perfectly out of phase what can be said about the resultant wave?

There isn’t one. The oscillations of the waves cancel each other perfectly leaving no wave.

28

When two waves cause a resultant wave with less energy than the initial wave what kind of interference is that?

Destructive interference.

29

Waves that are perfectly out of phase have a phase difference of what?

π

30

Calculate what 1 rad is in degrees.

1 rad = 360/2π = 57.3 degrees