Speed = distance / time
S= 40 000m / 5400s
S= 7.41m/s
Im pretty sure its C- Wavelength
Explanation:
It is given that,
Wavelength 1,
Wavelength 2,
Energy of a photon having wavelength 1 is given by :
Energy of a photon having wavelength 2 is given by :
Hence, this is the required solution.
B is your answer (:
I think.