Question

The work function of a surface determines the minimum ______________ of light which will cause electrons to be emitted.

A: wavelength

B: frequency

C: intensity

Visible light has wavelengths ranging from about 400 nm at the violet/blue end of the spectrum up to about 700 nm at the red end of the spectrum. If two sources emit the same number of photons per second, one near the red end of the spectrum will emit ________________ one near the blue end.

A: less energy than

B: more energy than

C: the same amount of energy as

Answer 1

The work function of a surface determines the minimum frequency of light which will cause electrons to be emitted

B: frequency

photon must have a minimum energy which is greater than or equals to the work function of the metal.

Visible light has wavelengths ranging from about 400 nm at the violet/blue end of the spectrum up to about 700 nm at the red end of the spectrum. If two sources emit the same number of photons per second, one near the red end of the spectrum will emit less energy than one near the blue end.

A: less energy than

Energy is always inversely proportional to the wavelength.