A photon has a frequency of 7.9×1014Hz. Could this photon supply enough energy to bridge an electronic gap of 5.0×10−19J in an atom?
a) No; calculating E=hν gives 5.2×10−20J, which is smaller than 5.0×10−19J.
b) Yes; the photon’s energy is about 5.2×10−19J, slightly greater than 5.0×10−19J, so the transition can occur.
c) No; since only the frequency is given and not the wavelength, the photon’s energy cannot be determined for comparison.
d) Yes; because any photon in the visible region necessarily carries more than 5.0×10−19J of energy.