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A body of mass 10 mg is moving with a velocity of 100 ms^-1. The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10^-34 Js)

A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10-34 Js)
a) 6.63 × 10-37 m
b) 6.63 × 10-31 m
c) 6.63 × 10-34 m
d) 6.63 × 10-35 m

Answer: b
Explanation: m = 10 mg
= 10 × 10-6 kg
v = 100 ms-1
λ = (h)/(mv)
= (6.63×10-34)/ (10 × 10-6 × 100)
= 6.63 × 10-31 m

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