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Units And Measurement

Question

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The nucleus _ZX^A 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-2Y ^A-4.

Solution

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

Some More Questions From Units and Measurement Chapter

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

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

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