Question

When a metal was exposed to light at a frequency of 3.01× 1015 s–1, electrons were emitted with a kinetic energy of 5.90× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) with a total energy of 7.65× 10–7 J?

Ionization energy is the energy needed to eject an electron from an atom. Compute the ionization energy of a hydrogen atom in its fourth excited state (n = 5).

The frequency of the middle C note on a piano is 261.63 Hz. What is the wavelength of this note in centimeters? The speed of sound in air is 343.06 m/s.