Figure 1
J | K | L | |
A | infrared | radio | ultraviolet |
B | radio | infrared | ultraviolet |
C | ultraviolet | infrared | radio |
D | ultraviolet | radio | infrared |
[1]
Which of these is the same for all electromagnetic waves travelling in a vacuum?
☐ | A | amplitude | |
☐ | B | frequency | |
☐ | C | speed | |
☐ | D | wavelength |
[1]
X-rays can be useful and harmful to humans.
Figure 2
Use words from the box to complete the following sentences.
chemical | infrared | radio | thermal | ultraviolet |
The electromagnetic waves that the fire mostly emits are .............................................................. waves.
These waves transfer .............................................................. energy to the hands.
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