Monochromatic Light Is Incident on a Metal Surface, and the Ejected

question 5

Multiple Choice

Monochromatic light is incident on a metal surface, and the ejected electrons give rise to a current in the circuit shown in the figure. The maximum kinetic energy of the ejected electrons is determined by applying a reverse ('stopping') potential, sufficient to reduce the current in the ammeter to zero. If the intensity of the incident light is increased, how will the required stopping potential change?

• A) It will increase.
• B) It will decrease.
• C) It will remain unchanged.

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Definitions:

Stimulus Control

The process by which behaviors are modified by the presence or absence of certain stimuli.

Classical Conditioning

An educational method where associations are made between a naturally occurring stimulus and an environmental one, resulting in a conditioned reaction.

Operant Conditioning

An educational method where the intensity of an action is altered through rewards or penalties.

Spontaneous Recovery

The reappearance of a previously extinguished response after a period without exposure to the conditioned stimulus.