# Physics P1.5

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• Created by: Matty_G16
• Created on: 20-05-16 11:41
When a longitudinal wave passes through air, what happens to the air particles at a compression?
They are pushed closer together.
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What type of wave can be produced on a stretched string?
Transverse, mechanical waves.
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What is the speed of waves with a frequency of 5 Hz and a wavelength of 2 m?
10 m/s.
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What is the unit of frequency?
Hertz, Hz.
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What is the normal?
A line drawn perpendicular to a reflecting surface.
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What size is the image in a plane mirror?
The same size as the object.
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Why does refraction take place?
Because waves change speed when they cross a boundary.
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Why does light split up into different colours when it passes through a triangular prism?
Because different wavelengths of light are refracted by different amounts.
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Why don't we often observe the diffraction of light during everyday life?
Because wavelength of light is very short.
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What sort of waves are diffracted?
All waves are diffracted.
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What is the range of frequencies that can be heard by the human ear?
20 Hz to 20,000 Hz (20 kHz).
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What is the reflection of a sound called?
An echo.
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What happens to the pitch of a note as the frequency increases?
The pitch decreases.
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Why do different instruments sound different when they play the same note?
The wave forms are different.
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## Other cards in this set

### Card 2

#### Front

What type of wave can be produced on a stretched string?

#### Back

Transverse, mechanical waves.

### Card 3

#### Front

What is the speed of waves with a frequency of 5 Hz and a wavelength of 2 m?

### Card 4

#### Front

What is the unit of frequency?

### Card 5

#### Front

What is the normal?

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