Exam code: J250
Some electromagnetic waves are used to scan a person in hospital.
Which statement is true about a scan that uses electromagnetic waves?
Micro-waves are used to scan skin.
Ultrasound waves are used to scan an unborn baby.
Ultra-violet is used to scan for cancer.
X-rays are used to scan for broken bones.
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Which row in the table describes all electromagnetic waves?
| Type of wave | Speed of wave in space |
A | Longitudinal | Changes with wavelength. |
B | Longitudinal | Stays the same. |
C | Transverse | Changes with wavelength. |
D | Transverse | Stays the same. |
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Which electromagnetic waves have the highest frequency?
Gamma rays
Microwaves
Radio waves
Ultra-violet rays
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4 marksWhich statement is true for electromagnetic waves?
High frequency electromagnetic waves have a long wavelength.
High frequency electromagnetic waves have no wavelength.
Low frequency electromagnetic waves have a long wavelength.
Low frequency electromagnetic waves have a short wavelength.
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Which row in the table is correct?
| Electromagnetic wave | Use |
A | Radio | Killing bacteria |
B | Microwaves | Mobile phones |
C | X-rays | Optical fibres |
D | Gamma rays | Tanning beds |
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Electromagnetic waves can be ordered by frequency.
Which answer shows the waves in order of increasing frequency? Low frequency
High frequency
A | Infra-red | Visible light | X-rays |
B | Visible light | Infra-red | X-rays |
C | Visible light | X-rays | Infra-red |
D | X-rays | Visible light | Infra-red |
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An electromagnetic wave transfers energy.
Which row in the table is correct?
| Electromagnetic wave | Energy transfer |
A | Infra-red | From a heating element of a toaster to the bread inside |
B | Radio | From a radio to a transmitter |
C | Gamma rays | From a high voltage supply to heating water in food |
D | X-rays | From bones in the body to an X-ray machine |
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Which waves can damage cells and cause cancer?
Radio, X-rays and infra-red.
Sound, gamma-rays and microwaves.
Sound, visible light and ultraviolet.
Ultraviolet, gamma-rays and X-rays.
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Which statement is not true of all electromagnetic waves?
They have the same wavelength.
They are transverse waves.
They can travel through a vacuum.
They travel at 300 000 000 m/s.
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Which row A, B, C or D, is true for electromagnetic waves?
| Transmission | Type | Movement in space |
A | Transmit energy from absorber to source | Longitudinal | Travel through space at different velocities |
B | Transmit energy from absorber to source | Transverse | Travel through space at different velocities |
C | Transmit energy from source to absorber | Longitudinal | Travel through space where all have the same velocity |
D | Transmit energy from source to absorber | Transverse | Travel through space where all have the same velocity |
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1 markWhat type of wave is light?
A longitudinal electromagnetic wave
A longitudinal P wave
A transverse S wave
A transverse electromagnetic wave
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