Q.

A wavelength of 400 nm corresponds to

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a

frequency (v) = 7.5 × 1014 Hz

b

wave number = 2.5 × 10 6 m-1

c

momentum (mv) = 1.66 × 10-27 kg ms-1

d

All of the above

answer is D.

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Detailed Solution

Wavelength, λ=400 nm = 400 × 10-9 m∴   Momentum, mv =hλ=6.62×10-34 Js400×10-9 m =1.66×10-27 J sm-1 =1.66 × 10-27 kg m2s-2m-1s [1 J = 1 kg m2s-2] =1.66×10-27 kg ms-1 (correct)
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