Calculate the mass of a photon with wavelength 4.8?
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1.lamda = 3.6 angstrom = 3.6 x 10^-10 m.
2.velocity of photon = velocity of light.
3.m = h/lamda*v ( from de-brogile's equation)
4.m = 6.626 x 10^-34/3.6 x10^-10 x 3 x 10^8.
5.m = 6.626 x 10^-32/10.8.
6.m = 0.6135 x 10^-32.
7.m = 6.135 x 10^-33 kg.
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