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Physics Yr 9 > P5.1 > Flashcards

P5.1 Flashcards

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1
Q

What is amplitude?

A

It is how far the wave travels from the centre

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2
Q

What is the symbol for amplitude?

A

The symbol is a

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3
Q

What can amplitude be measured in?

A

Anything really, m, w, cm

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4
Q

What is the wavelength?

A

The length of 1 completed wave

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5
Q

What is the symbol for wavelength?

A

The symbol is lambda

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6
Q

What is the wavelength measured in?

A

Metres

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7
Q

What is the frequency?

A

The number of waves per second

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8
Q

What is frequency measured in?

A

Hertz (Hz)

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9
Q

What is the time period?

A

How long it takes to complete 1 wave

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10
Q

What is the time period measured in?

A

Seconds

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11
Q

What is the symbol for the time period?

A

T

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12
Q

What is the formula for frequency.

A

1/ time period

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13
Q

What is the speed of a radio wave and the speed of light?

A

3 x 10 to the power of 8 m/s

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14
Q

What is the formula for wave speed?

A

Frequency x wavelength

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15
Q

What happens to the wavelength if the frequency gets bigger?

A

The wavelength gets shorter

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16
Q

What is the formula for wavelength?

A

The speed of light (3 x 10 to the power of 8) / frequency

17
Q

In terms of waves, what has the highest frequency (descending order)?

A 
Radio waves
Microwaves
Infrared waves
Visible light
Ultra violet
X-rays
Gamma rays
18
Q

What happens to a sound wave at a boundary?

A

The sound can be:
Reflected (an echo)
Transmitted (and possibly refracted)
Absorbed

19
Q

What is ultrasound?

A

Is the sound of a frequency greater than 20,000 hertz

Physics Yr 9 (6 decks)

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