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Physics AQA A Level > Waves > Flashcards

Flashcards in Waves Deck (20)
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1

Define a Cycle

One complete vibration of a wave

2

Define displacement

How far a point has moved
From its undisturbed position

3

Define Amplitude

Maximum magnitude of displacement
From 0

4

Define period

Time taken per wave cycle
Seconds

5

Define frequency

Wave cycles per second
Hertz

6

Define phase

A measurement of the position of a certain point along the wave cycle

7

Define phase difference

Amount that one wave lags behind another
In degrees/radians or fraction of wavelength

8

Define reflection

Wave changes direction at a boundary

9

Define refraction

Wave enters different medium (of different n)
Changes speed and
Bends towards/away from the normal

10

Define a progressive wave

A wave that transmits energy from one place to another
Without transmitting matter

11

How is a stationary wave produced?

Two identical progressive waves (of same wavelength)
Travelling in opposite directions
Superimpose

12

What is the principle of superposition?

When two waves meet
Total displacement at any point = sum of individual displacements at that point

13

Define a longitudinal wave

Particle vibrations(energy transfer) parallel to direction of movement

14

Define a transverse wave

Particle vibrations(energy transfer) are perpendicular to direction of movement

15

What is coherence?

When 2 waves have the same frequency and constant phase difference

16

In a single slit interference pattern...

The subsidiary maxima are half the length of the central maxima

17

Define monochromatic light

Light of a single wavelength

18

Differences between Monochromatic and white light when passing through a slit?

Full spectra in subsidiary maxima in white light
Central white maxima
Wider maxima

19

How do sound waves transmit energy?

Vibrating source
Energy transfered to molecules in medium
Molecules collide .. Oscillations
Pressure waves transfer energy in direction of movement

20

How to prove a wave is transverse?

Polarisation