# Calculate the de Broglie wavelength of (i) an electron (in the hydrogen atom) moving with a speed of $\frac{1}{100}$of the speed of light in vacuum and (ii) a ball of radius 5 mm and mass 3 × 10–2 kg moving with a speed of 100 ms–1. Hence show that the wave nature of matter is important at the atomic level but is not really relevant at the macroscopic level.

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(i)

• -1
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