Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 22
Two lasers emit light in a vacuum. One laser emits red light and the other emits green light. Which property of the two laser beams must be different?
- Aamplitude
- Bfrequency
- Cintensity
- Dspeed
As printed in the paper
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Correct answer: B. frequency
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