(4%) Problem 10: A ?-ray photon has a momentum of 8.5 x 10-21 kgm/s Randomized V

Question

(4%) Problem 10: A ?-ray photon has a momentum of 8.5 x 10-21 kgm/s Randomized Variables p 8.5x 1021 kg-m/s ? 50% Part (a) what is its wavelength in meters? Grade Summary Deductions Potential 0% 100% cos0 Submissions sinO cotan) asin) Attempts remaining: 7 acos) % per attempt) detailed view atan0 acotan0 sinh0 coshO tanhO cotanhO Degrees O Radians 0 END BACKSPACE DELCLEAR Submit Hint I give up! Hints: 0% deduction per hint. Hi ints remaining: 4 Feedback: 0%-deduction per feedback. 50% Part (b) Calculate its energy in mega-electron volts

Explanation / Answer

gama ray momentum, P=8.5*10^-21 kg/m.sec

a)

use,

lambda=h/P

lambda=6.626*10^-34/(8.5*10^-21)

lambda=7.795*10^-14 m

b)

energy, E=h*c/lambda

=6.626*10^-34*3*10^8/(7.795*10^-14)

=2.55*10^-12 Joule

=2.55*10^-12*(6.242*10^12)

=15.917 Mev

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