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Physics > Waves > Flashcards

Waves Flashcards

1
Q

What is wavelength

A

This is the distance from one point in a wave to the corresponding point on the next wave

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2
Q

What is amplitude

A

The height of a wave from the middle to the top (or middle to the bottom).

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3
Q

What is frequency

A

The number of waves per second

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4
Q

What is the period

A

The time taken for one complete wave to pass a point

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5
Q

What is wave speed

A

Distance traveled by wave in one second

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6
Q

What are the 2 types of waves?

A

Transverse waves and longitudinal waves

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7
Q

How do transverse waves move?

A

The particles move at right angles to the direction of energy travel

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8
Q

How do longitudinal waves move?

A

The particles move parallel to the direction of energy travel

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9
Q

What waves are transverse?

A

Water and all the waves on the electromagnetic spectrum are transverse waves

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10
Q

What waves are longitudinal?

A

Sound waves are longitudinal waves

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11
Q

What is the formula for frequency?

A

f=N/t

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12
Q

What is the formula for the period?

A

T=1/f

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13
Q

What is the formula for the Wave equation?

A

v=f λ

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14
Q

What is the formula for speed, distance and time?

A

V=d/t d=v/t

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15
Q

What is the symbol and unit for wavelength?

A

Symbol- λ
Unit- Metre (m)

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16
Q

What is the unit for amplitude?

A

Unit- metre (m)

17
Q

What is the symbol and unit for frequency?

A

Symbol- f
Unit- Hertz (Hz)

18
Q

What is the symbol and unit for the period?

A

Symbol- T
Unit- second (s)

19
Q

What is the symbol and unit for wave speed?

A

Symbol- v
Unit- Metres per second (ms^-1)

20
Q

When does diffraction occur?

A

Diffraction occurs when waves pass through a gap or around an object

21
Q

True or false: Short wavelengths diffract more that long wavelengths

A

False: long wavelengths diffract more than short wavelengths

22
Q

What happens if the gap is less than a wavelength?

A

Circular wavefronts are produced

23
Q

What happens if the gap is greater than a wavelength?

A

If the gap is greater than a wavelength then only the ends of the waves show diffraction

24
Q

What do all the parts of the electromagnetic spectrum travel at?

A

The speed of light

25
What are the parts of the electromagnetic spectrum?
Radio, microwave, infrared, visible, ultraviolet, x-ray, gamma ray
26
Electromagnetic spectrum- What has the highest frequency?
Gamma radiation
27
What is refraction of light?
When light passes from one medium to another its speed and wavelength changes. The direction of the ray may also change.
28
What happens when light enters a block at a right angle?
The light will pass straight through it
29
What happens when light passes through a block at an angle?
The light appears to bend
30
Refraction of light- what is the normal?
The normal is a reference line, drawn at right angles to the surface where the incident ray touches it.
31
What happens when light passes through a semicircular block on the curve side?
The light travels along the normal. The light is refracted when it leaves the block as long as the angle of the incident is below a certain value for that material
32
What happens when light passes through a triangular prism?
When light passes through a prism it will change direction as it enters and as it leaves the block due to refraction.
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