What Wavelength of Light Is Required to Cause the Ejection

question 17

Multiple Choice

What wavelength of light is required to cause the ejection of photoelectrons with kinetic energies of 5.0 *10^-20 J from a calcium surface ( = 4.60 * 10^-19 J) ?

• A) 485 nm
• B) 390 nm
• C) 308 nm
• D) 632 nm
• E) 480 nm

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Definitions:

Forward-bias

A condition in which a diode allows current to flow more easily, achieved by applying positive voltage to the anode relative to the cathode.

Enclosure

A housing or case designed to protect electronic or mechanical equipment from environmental conditions.

Conductive Dust

Dust particles that can conduct electricity, which can create short circuits and other electrical hazards if deposited on electronic components.

Bleeder Resistor

A resistor connected across the output of a power supply or within an electrical circuit to discharge residual high voltage after power is turned off, enhancing safety.