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2. Absence of a time lag. An electron is freed the instant the atom absorbs a photon of enough energy. It doesn’t accumulate energy.

• Current will be less in dim light than in bright light since fewer  photons with enough energy eject fewer electrons per unit time.

Problem: A microwave oven has a frequency of 2.45 x 10 9 s –1 . What is the energy of one photon of this microwave radiation?

• The quantum and photon theories ascribed features to radiation that  had been reserved for matter: fixed amount and discrete particles.

Skill 7-2. Interconverting the energy of a photon with its frequency and/or wavelength

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