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If the wavelength of light is 4000 Å then the number of waves in 1mm length will be _______

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If the wavelength of light is 4000 Å then the number of waves in 1mm length will be _______ 

(A) 2.5 

(B) 2500 

(C) 250 

(D) 25000

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1 Answer

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The correct option is (B) 2500.

Explanation:

Wavelength = λ = 4000 Å = 4000 × 10–10m

Given length = ℓ = 1mm = 10–3m

∴ No of wave in length ℓ = (ℓ/λ) = [10–3 / (4000 × 10–10)] = (104 / 4) = 2500

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