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Wave Optics

Question
CBSEENPH12039884

The binding energy per nucleon of Li presubscript 3 presuperscript 7 space and space He presubscript 2 presuperscript 4 nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction, Li presubscript 3 presuperscript 7 space plus space straight H presubscript 1 presuperscript 1 space rightwards arrow space He presubscript 2 presuperscript 4 space plus space straight Q, the value of energy Q released is,

  • 19.6 MeV

  • -2.4 MeV

  • 8.4 MeV

  • 17.3 MeV

Solution

D.

17.3 MeV

The binding energy for straight H presubscript 1 superscript 1 is around zero and also not given in the question so we can ignore it,
straight Q space equals space 2 space left parenthesis 4 space straight x space 7.06 right parenthesis space minus space 7 space straight x space left parenthesis 5.60 right parenthesis

space space space space equals space left parenthesis 56.48 space minus space 39.2 right parenthesis MeV

space space space space equals space 17.28 space MeV

space space space space equals 17.3 space MeV

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