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Light of a certain colour has 1800 waves to the millimetre in air. What is its frequency in water?

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Light of a certain colour has 1800 waves to the millimetre in air. What is its frequency in water?

[n = \(\cfrac43\) for water] 

(A) 1.67 × 106Hz 

(B) 4.05 × 1014 Hz 

(C) 5.4 × 1014 Hz 

(D) 7.2 × 1014 Hz.

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1 Answer

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(C) 5.4 × 1014 Hz 

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