A photon has an energy of 2.93 X 10-25 J. What is its wavelength?
The energy is related to wavelength as
`E = (hc)/lambda`
where, h is the Planck's constant (6.626 x 10^-34 J s) and c is the speed of light in vacuum (3 x 10^8 m/s)
Thus, the wavelength can be calculated as:
wavelength = hc/E
= `(6.626 xx 10^(-34) xx 3 xx 10^8)/(2.93 xx 10^-25)`
= 0.678 m
Hope this helps.