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Find the Q value of the reaction p+{ }^{7} {Li} { }^{4} {He}+{

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Medium

Solving time: 3 mins

Find the $Q$ value of the reaction $p +^{7} Li \to^{4} He +^{4} He$ . Determine whether the reaction is exothermic or endothermic. The atomic mass of $^{1} H,^{4} He$ and $^{7} Li$ are $1.007825 amu, 4.002603$ amu and $7.016004$ amu respectively.

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Book:

Physics Galaxy Optics and Modern Physics Vol 4 (Ashish Arora)

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Mateo Discussed

Find the

Q

value of the reaction

p +^{7} Li \to^{4} He +^{4} He

. Determine whether the reaction is exothermic or endothermic. The atomic mass of

^{1} H,^{4} He

and

^{7} Li

are

1.007825 amu, 4.002603

amu and

7.016004

amu respectively.

15 mins ago

Discuss this question LIVE

15 mins ago

Text solutionVerified

Mass defect of this reaction is

Δ m = 1.007825 + 7.016004 - 2 (4.002603)

Δ m = 0.018623 amu

\Rightarrow Δ m = 0.018623 amu

As mass defect is positive, this reaction releases energy so it is exothermic reaction and its

Q

-value is

\Rightarrow E = 0.018623 \times 931.5 MeV

E = 17.347 MeV

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Question Text	Find the $Q$ value of the reaction $p +^{7} Li \to^{4} He +^{4} He$ . Determine whether the reaction is exothermic or endothermic. The atomic mass of $^{1} H,^{4} He$ and $^{7} Li$ are $1.007825 amu, 4.002603$ amu and $7.016004$ amu respectively.
Topic	Nuclei
Subject	Physics
Class	Class 12
Answer Type	Text solution:1
Upvotes	61

Find the $Q$ value of the reaction $p +^{7} Li \to^{4} He +^{4} He$ . Determine whether the reaction is exothermic or endothermic. The atomic mass of $^{1} H,^{4} He$ and $^{7} Li$ are $1.007825 amu, 4.002603$ amu and $7.016004$ amu respectively.

Text solutionVerified

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Text solutionVerified

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Find the $Q$ value of the reaction $p +^{7} Li \to^{4} He +^{4} He$ . Determine whether the reaction is exothermic or endothermic. The atomic mass of $^{1} H,^{4} He$ and $^{7} Li$ are $1.007825 amu, 4.002603$ amu and $7.016004$ amu respectively.