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(C) According to the de Broglie hypothesis, every moving particle, whether it is charged (like an electron) or uncharged (like a neutron), is associat

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Any particle in motion, whether charged or uncharged, is accompanied by matter waves.

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(C) According to the de Broglie hypothesis, every moving particle, whether it is charged (like an electron) or uncharged (like a neutron), is associated with a wave known as a matter wave or de Broglie wave.The wavelength $(\lambda)$ of this wave is given by the relation $\lambda = \frac{h}{p}$, where $h$ is Planck's constant and $p$ is the momentum of the particle.Therefore, the correct statement is that any particle in motion, whether charged or uncharged, is accompanied by matter waves.

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The de Broglie wavelength of an oxygen molecule at $27^{\circ} C$ is $x \times 10^{-12} \ m$. The value of $x$ is (take Planck's constant $= 6.63 \times 10^{-34} \ J \cdot s$, Boltzmann constant $= 1.38 \times 10^{-23} \ J/K$, mass of oxygen molecule $= 5.31 \times 10^{-26} \ kg$).

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