Nuclei - Result Question 93

95. The mass of α-particle is

[1992]

(a) less than the sum of masses of two protons and two neutrons

(b) equal to mass of four protons

(c) equal to mass of four neutrons

(d) equal to sum of masses of two protons and two neutron

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Answer:

Correct Answer: 95. (a)

Solution:

  1. (a) α-particle =2He4. It contains 2p and 2n. As some mass is converted into B.E., therefore, mass of α particle is slightly less than the sum of the masses of 2p and 2n.

(d) NN0=(12)6400/1600=(12)4=116



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