Thermal Imaging and Infrared Therapy Quiz

What principle do scientists use to classify stars based on their color and temperature?

• Quantum mechanics

• Blackbody radiation

• Electromagnetic induction

• Gravitational waves

What is the form of radiation emitted by objects that thermal imaging cameras detect?

• X-ray radiation

• Blackbody radiation

• Cosmic radiation

• Radioactive radiation

Which of the following is NOT an application of the photoelectric effect mentioned in the text?

• Electric eye door openers

• Light meters

• Solar panels

• Electric cars

What technology uses the photoelectric effect for automatic door opening?

• Light meters

• Electric eye door openers

• Solar panels

• Photostatic copying

What is a real-life application of the photoelectric effect in generating electricity?

• Electric eye door openers

• Light meters

• Solar panels

• Photostatic copying

Which of the following uses the photoelectric effect in its operation?

• Electric eye door openers

• Light meters

• Both A and B

• Neither A nor B

Which of the following is NOT a unit of electric current?

• Ampere

• Milliampere

• Coulomb

• Microampere

What is a blackbody?

• A body that reflects all incident radiation

• A body that absorbs all incident radiation

• A body that emits no radiation

• A body that only absorbs visible light

How does the bouncy ball and soft sponge analogy relate to the photoelectric effect?

• The speed of light determines if electrons are ejected.

• Only high-energy photons (like the bouncy ball) can eject electrons.

• A stronger force will always open the door.

• Electrons are ejected only when metal is heated.

Minimum fraquency required for photoelectric effect is called:

• top frequency

• threshold frequency

• maximum frequency

• None of these