Question

The photometer is a device that converts light to voltage which is read out by the digital multimeter (DMM). This is due to the photoelectric effect. (Einstein won his Nobel Prize for his explanation of the photoelectric effect.) In the photoelectric effect, light hits a piece of metal. Quantum mechanics tells us that light can be thought of as tiny packets of energy called photons. The photons are absorbed by electrons and increase the energy of the electrons. Some of the electrons become so energetic that they escape from the metal. In other words electrons are emitted from the metal, producing a current that is amplified by the photometer. The current goes through a resistor in the photometer. Ohm's law (V=IR) tells us that current I going through a resistor R is associated with a voltage drop V. The DMM measures the voltage drop across the resistor. Saturation occurs when the metal emits the maximum flux of electrons that it can produce. (Or it may be the maximum amplification of the photometer.)

What does a photometer do?
B. It converts light into electric current.

A. It emits light.
B. It converts light into electric current.
C. It measures the frequency of light.
D. It emits sound.

Answer 1

A photometer converts light into electric current by using the photoelectric effect, where light ejects electrons from a material, creating an electric current that is measured by a digital multimeter.

Step-by-step explanation:

The description of a photometer matches the function given by answer choice B: It converts light into electric current. This device uses the photoelectric effect, which occurs when light ejects electrons from a material. In the context of the photometer, when photons (light) hit the metal, they release electrons that are subsequently measured as electric current. The current is calculated using Ohm's Law, creating a voltage drop across a resistor, which is read by a digital multimeter (DMM).

Answer 2

Option B

It converts light into electric current

Step-by-step explanation:

A photometer is a device used to measure illuminance

Its principle of operation hinges on the conversion of light into electric current, using photoresistor or any other light sensitive device such as a photodiode. This is so that it can be read off easily by any other device.

A Photoresistor is a device that changes the flow of current through it when it is exposed to light rays. A photometer works by irradiating a photo resistor, which then converts the light rays incident on it to electric current.