Question

Rank the following photons in terms of increasing energy. (Use the drop down options, and choose '1' for the lowest photon energy, '2' for the next lowest, etc.) Yellow (λ = 590 nm) Red (λ = 680 nm) Blue (λ = 443 nm) Microwave (ν = 7.5×1011 Hz) Ultraviolet (ν = 8.7×1015 Hz)

Answer 1

Energy of photon can be calculated by using the following formula:

                                                             E = hc/

Hence the energy for the yellow photon = hc/590 * 10^-9m

                                                          = 6.625*10^-34J sec. *3*10^8 m sec-1 * 1.7 * 10^6 m-1

                                                          = 33.8 *10^-20 J

the energy for the red photon= 6.625*10^-34J sec. *3*10^8 m sec-1 * 1.5*10^6 m-1

                                          = 29.8*10^-20 J

the energy for the blue photon= 6.625*10^-34J sec. *3*10^8 m sec-1 * 2.26 *10^6 m-1

                                           = 44.9 *10^-20 J

the energy for the microwave photon E= h

                                                       = 6.625*10^-34J sec.* 7.5 *10^11 sec-1

                                                       = 49.7 *10 ^-23 J

the energy for the ultraviolet photon E= h

                                                       = 6.625*10^-34J sec.* 8.7 *10^15 sec-1

                                                       = 57.6* 10 ^-19 J

Energy order:

microwave < red photon <yellow photon < blue photon < ultraviolet