When the Surface of a Metal Is Exposed to Blue

question 101

Multiple Choice

When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following things will also increase?

• A) the time lag between the onset of the absorption of light and the ejection of electrons
• B) the work function of the metal
• C) the number of electrons ejected per second
• D) the maximum kinetic energy of the ejected electrons
• E) all of the above

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Definitions:

Inactive RNA Polymerase

An RNA polymerase enzyme in a resting state that is not involved in the transcription of DNA into RNA.

Negative Control

An experiment or part of an experiment where no response is expected, serving to highlight the effect of the experimental treatment.

Repressible Genes

Genes whose expression can be decreased or turned off by the presence of a specific molecule.

Transcription

The process by which genetic information encoded in DNA is copied into messenger RNA (mRNA) for protein synthesis.