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Grade 11Modern Physics

I`m getting the answer as quarter times of initial energy in question in the image.. but answer given is thrice the initial energy. Give me solution to it.

Question image for I`m getting the answer as quarter times of initial

Preeti

8 Years agoGrade 11

1 Answer

Vaidehi

8 Years ago

let E1 be the initial energy and E2 be the final one.Initial momentum be P1 and final be P2.we know $P=h/\lambda$

therefore $(P1/P2)=\lambda 2/\lambda 1=0.5$

ie P2=2 P1

Also $E=(P^2)/2m$

$(E1/E2)=P1^2/P2^2$

$(E1/E2)=(1/4)$

E2=4E1

$Energy to be added=E2-E1=3E1$

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