1.

Mass numbr of the elements A, B, C and D are 30, 60, 80 and 120 respectilvely. The specific binding energy of them are 5 MeV, 8.5 MeV, 8 MeV and 7 MeV respectively. Then, in which of the following reaction/s energy released ? 1.D. to 2B 2.C to B+A 3.B to 2A

Answer»

in (1), (2) and (3)
only in (1)
in (2), (3)
in (1), (3)

Solution :`triangleE=2 xx 60 xx 8.5 -120 xx 7=180MeV`
`triangleE=60 xx 8.5 xx 30 xx 5-90 xx 8=-60MeV`
`triangleE=2 xx 30 xx 5 -60 xx 8.5 =-105MeV`
Hence, ENERGY is relased in (1) only.


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