calculate mass of photon with wavelength 3.6 A ^. ?

given : wavelength = 3. 6 Ao = 3.6 x 10 ^-10 m  

we need to know that velocity of light = velocity of photon = 3 x 10 ⁸ ms^-1 

= 6.626 x10^-34 kg m² s ^-2    / ( 3.6 x 10 ^-10 m  ) ( 3 x 10 ⁸ ms^-1 ) 

= 6.626 x 10 ^-34 / 10.8 x 10 ^-2 

 = 0.613 x 10 ^-32 = 6.13 x 10 ^-33 kg  

hope u got it