A ball of mass 0.66 kg moves at 100 m/s. The de Broglie wavelength associated with it (given h = 6.6 times 10^ -34 Js) will be:

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NEET Chemistry QUESTION #7354

Question 1

A ball of mass 0.66 kg moves at 100 m/s. The de Broglie wavelength associated with it (given \(h = 6.6 \times 10^{-34}\) Js) will be:

\(6.6 \times 10^{-34}\) m
\(1.0 \times 10^{-35}\) m✔️
\(1.0 \times 10^{-32}\) m
\(6.6 \times 10^{-32}\) m

Correct Answer Explanation

de Broglie formula: \(\lambda = \dfrac{h}{mv}\)

\(\lambda = \dfrac{6.6 \times 10^{-34}}{0.66 \times 100} = \dfrac{6.6 \times 10^{-34}}{66} = 1.0 \times 10^{-35}\) m

This wavelength is vanishingly small, which is why macroscopic objects do not show observable wave behaviour — confirming why quantum effects are only relevant at the atomic/subatomic scale.

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