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Units and Measurement
Question
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The nucleus ZXA at rest undergoes a decay. If the α-particle emits with velocity 2.4x107 m/s, then find the velocity of centre of mass of a particle and daughter nuclei Z-2 Y A-4. 

Answer

Since the parent nucleus is at rest before decay, therefore the velocity of the centre of mass after decay is zero.

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Some More Questions From Units and Measurement Chapter

Give four examples of physical quantities.

Define unit.

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Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

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Can a physical quantity have two or more units? Give example.