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Question
The difference between lightwaves approaching and lightwaves receding isA) when approaching, lightwaves have higher frequency; when receding their frequency is lower.
B) when approaching, lightwaves have lower frequency; when receding their frequency is higher.
C) the frequency of approaching lightwaves remain constant, while receding lightwaves are invisible.
D) There is no difference
Answer
This answer is hidden. It contains 1 characters.
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