Question
Brief pulses of red, blue and green light are emitted from the Sun at the same time.
The pulses travel the same distance to reach Mars. Assume that the pulses travel in a vacuum for the full duration of their journey.
In which order would these pulses of light arrive at Mars?
A all arrive at the same time
B blue first, then green, then red
C red first, then blue, then green
D red first, then green, then blue
Answer/Explanation
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Question
Which radiation could consist of waves of wavelength 0.5 nm?
A ϒ-rays
B ultraviolet
C visible light
D X-rays
Answer/Explanation
Question
Microwaves in a vacuum travel at speed X and have wavelength of order of magnitude Y.
What are the speed and a possible order of magnitude of wavelength of X-rays in a vacuum?
Answer/Explanation
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Question
What is the order of magnitude of the wavelengths of microwaves and X-rays?
| wavelength of microwaves / m | wavelength of X-rays / m | |
A B C D | 10–6 10–2 10–6 10–2 | 103 103 10–10 10–10 |
Answer/Explanation
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Question
What is not a possible value for the wavelength of the named electromagnetic waves when it is
travelling in a vacuum?
Answer/Explanation
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