1 pc

A red light beam is shining on a piece of cesium that is connected in a

photoelectric circuit. What should be added to the circuit to determine

whether red light produces photoelectrons? *

A voltmeter

An ammeter

A battery

A spectroscope

A spectroscope

Explanation:

A spectroscope is used by scientists to separate a source of light ( usually white light ) into its various compositions. i.e it is used to determine the chemical makeup of a visible source of light. hence to determine whether the red light produces photo electrons, which is a chemical makeup of visible light a spectroscope should be added to the circuit.

photo electrons are electrons emitted/ejected from a surface usually metallic surface in the form of a photoelectric effect  when a source of light is shines on the surface

gravity

explanation:

their crystal patterns have been disrupted by stress