Question

The de Broglie wavelength of a tennis ball of mass 60 g moving
with a velocity of 10 metres per second is approximately
(a) 10⁻³¹ metres (b) 10⁻¹⁶ metres
(c) 10⁻²⁵ metres (d) 10⁻³³ metres
Planck’s constant, h = 6.63 × 10⁻³⁴ Js

Answer 1

The wavelength of the tennis ball is λ = 10^-33 m. Option (d) is correct.

Explanation:

• Given data:
• Mass of ball m = 60 g
• Velocity v = 10 m/s
• Plank constant h = 6.63 × 10^ −34  Js

We know that:

λ = h /  m.v

λ =  60 × 10 ^−34  / 60 x 10^-3 x 10

λ = 1.1 x 10^-33

λ = 10^-33 m

Hence the wavelength of the tennis ball is λ = 10^-33 m.

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The de -Broglie wave length associated with particle of mass 10^-6 kg moving with a velocity of 10 m/s is ?

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