8/17/2019 Worksheet Photon Energy

http://slidepdf.com/reader/full/worksheet-photon-energy 1/1

Physics AS homework

An electron and anti –electon pair can annihilate each other producing gamma rays.

1. .Calculate the rest mass of the pair in MeV.

2. What is the minimum energy of the gamma rays produced in this process?

3. It is possile that gamma rays !ith greater energy than this can e produced in

this process" e#plain !hy.

$ Visile light has a !a%elength et!een $&& and '&&nm. Calculate the minimum and

ma#imum fre(uency of %isile light.

) A micro!a%e source is radiating at a !a%elength of 2mm

a* Calculate the fre(uency of the micro!a%es.

 * Calculate the +nergy of the indi%idual photons in the radiation.

c* Calculate the energy of a photon of %isile light of !a%elength ,)&nm.

d* Calculate the energy of a gamma photon of , # 1&-1)m !a%elength.

e* Compare your results for "c and d. What do you oser%e.

f* i%e each of the energy %alues in MeV" gi%en that 1eV/ 1., # 1&-10