UN Fisika 2016 Paket 1 Nomor 39

Perhatikan reaksi inti berikut!

4{}_{1}^{1}H\to ~{}_{2}^{4}He+2{}_{1}^{0}e+Q

Diketahui:

{}_{1}^{1}H=1,0081~sma

{}_{2}^{4}He=4,0038~sma

{}_{1}^{0}e=sangat~kecil~\left( diabaikan \right)

Jika 1 sma = 931 MeV, berapa energi yang dihasilkan pada reaksi inti di atas?

A.    0,00286 MeV D.    40,2832 MeV
B.     26,6266 MeV E.     92,2431 MeV
C.     35,3781 MeV

Penyelesaian

Energi ikat inti atau defek massa:

E=\text{ }\!\!\Delta\!\!\text{ }m.{{c}^{2}}

E=\text{ }\!\!\Delta\!\!\text{ }m.~931~MeV

E=\left\{ 4\left( 1,0081 \right)-\left( 4,0038 \right) \right\}\times 931~MeV

E=26,6266~MeV

jawaban B

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