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25 Cards in this Set
- Front
- Back
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What do waves transfer? |
Waves transfer energy. |
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Complete this sentence: In a transverse wave, the oscillations are ………………to the direction of energy transfer. |
In a transverse wave, the oscillations are perpendicular(right angles) to the direction of energy transfer. |
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Give an example of transverse waves. |
Transverse waves include electromagnetic waves (eg light, infrared) |
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Give an example of longitudinal waves. |
Longitudinal waves includesound waves. |
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What can we say about thespeed of electromagnetic waves in a vacuum? |
All electromagnetic waves travel at the same speed through a vacuum. |
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State the order of the electromagnetic spectrum |
Gamma (shortest wavelength, highest energy) X rays Ultraviolet Visible light Infrared Microwaves Radio waves (longest wavelength, lowest energy) |
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Which electromagnetic wave has the highest frequency? |
Gamma rays have the highest frequency. |
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What do we call an imaginary line that scientists draw at right angles to a mirror? |
The imaginary line drawn at right angles to a mirror is called the normal. |
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What happens when a wave is refracted? |
When a wave is refracted, it changes direction as it slows down or speeds up. |
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What happens to a wave when it slows down (eg light passing into a glass block). |
When a wave is refracted, it changes direction as it slows down or speeds up. |
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What happens to a wave when it speeds up (eg light passing out of a glass block). |
When a wave speeds up, it bends away from the normal. |
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What is the equation for the speed of a wave? |
v = f x m v = speed (m/s) f = frequency (hertz) m = wavelength (m) |
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What is meant by the frequency of a wave? |
The frequency of a wave is the number of waves persecond. The unit is hertz (Hz). |
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What is the unit of frequency? |
The unit of frequency is the hertz (Hz). |
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How are radio waves used for communication? |
Radio waves are used for radio and TV signals. Certain radiowaves can diffract around hills so houses in valleys can receive radio signals. |
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How are microwaves used for communication? |
Microwaves are used by mobile phones to communicate with the base station. They are also used to send signals to satellites. |
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How are infrared waves used for communication? |
Infrared waves are used by remote controls. |
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How is visible light used for communication? |
Visible light is used for photography. |
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What can we say about the angle of reflection and the angle of incidence when a wave reflects? |
angle of incidence = angle of reflection |
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What can we say about the image produced in a plane mirror? |
The image produced in a plane mirror is virtual. |
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How is a sound wave transmitted? |
Sound waves cause vibration of the particles in the medium in which they are travelling (eg air or water). |
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What happens to a sound when the amplitude of the sound wave is increased? |
When the amplitude of a sound wave is increased the sound is louder. |
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What happens to a sound when the frequency of the sound wave is increased? |
When the frequency of a sound wave is increased, the sound has a higher pitch |
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What is an echo? |
An echo is a reflected sound |
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What is meant by diffraction? |
When a wave passes through a gap that is about the same size as the wavelength, the wave spreads as it passes through the gap. This is called diffraction. |
