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Air to water for 589 nm light: its frequency (c = 3×10⁸ m/s) is?

A3.83×10¹⁴ Hz
B6.77×10¹⁴ Hz
C5.09×10¹⁴ Hz
D2.26×10¹⁴ Hz
Answer & Solution
Correct answer: C. 5.09×10¹⁴ Hz
Frequency stays fixed across the boundary and equals c over 589 nm, which is about 5.09×10¹⁴ Hz.
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