Nuclei - Result Question 41

42. The mass of proton is $1.0073 u$ and that of neutron is $1.0087 u$ ( $u=$ atomic mass unit). The binding energy of $ _2^{4} He$ is

[2003]

(a) $0.061 u$

(b) $0.0305 j$

(c) $0.0305 erg$

(d) $28.4 MeV$

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Answer:

Correct Answer: 42. (d)

Solution:

  1. (d) $\Delta m=(2 \times 1.0074+2 \times 1.0087-4.0015)$

$ =0.0307 $

$E=(\Delta m) \times 931 MeV=0.0307 \times 931=28.5 MeV$