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The frequency corresponding to the wavelengths $4000 A 0 is: ¯$

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6.5 × 1014 s − 1

7.5 × 1014 s − 1

5.5 × 1014 s − 1

4.5 × 1014 s − 1

answer is B.

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Detailed Solution

Concept: The speed of all electromagnetic waves is

3 × 108

meters per second.
There is no mention of electromagnetic waves, yet they may be considered waves with such small wavelengths. To determine the frequency, use

v = \frac{c}{λ}

v = \frac{c}{λ} = \frac{3 \times 10^{10}}{4000 \times 10^{- 8}} = 7.5 \times 10^{14} s^{- 1}

Hence, the correct option is 2.

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