Q52 / 55 · NEST (NISER) 2012 · Physics

Mean free path of cosmic ray proton in water at $4^{\circ} \mathrm{C}$ is $\lambda$. If water is cooled to $0^{\circ} \mathrm{C}$, then the change in mean free path in water

Correct answer
A
will be positive.
B
will be negative.
C
will be zero.
D
cannot be determined.

Hence, the correct answer is option: 'A'.

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