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# And Then There Was Light Trivia Quiz

### Visible light is a very small band within the electromagnetic spectrum. Physicists consider the entire spectrum to be light. How much do you know about light?

A multiple-choice quiz by drbabe. Estimated time: 3 mins.

Author
Time
3 mins
Type
Multiple Choice
Quiz #
331,514
Updated
Dec 03 21
# Qns
10
Difficulty
Average
Avg Score
7 / 10
Plays
755
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Question 1 of 10
1. Red light has a wavelength of about 700 nm. What is this measurement in meters? Hint

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Question 2 of 10
2. What is the interaction of light with matter called? Hint

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Question 3 of 10
3. When light passes from one medium to another it often bends. What is this bending called? Hint

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Question 4 of 10
4. What type of electromagnetic waves can have wavelengths on the order of meters? Hint

Question 5 of 10

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Question 6 of 10
6. How do microwaves cook food? Hint

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Question 7 of 10
7. What is another name for heat? Hint

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Question 8 of 10
8. What is the quantity that is the rate that a body radiates per unit time? Hint

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Question 9 of 10
9. What is the speed of light in the centimeter-gram-second(cgs)system? Hint

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Question 10 of 10
10. Which of the following technologies does not use electromagnetic radiation? Hint

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Jun 24 2024 : Guest 136: 6/10
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Quiz Answer Key and Fun Facts
1. Red light has a wavelength of about 700 nm. What is this measurement in meters?

One nanometer is one billionth of a meter, so 700 nm is six zeros after the decimal point before the seven.
2. What is the interaction of light with matter called?

In addition to interaction with light, optics includes instrumentation used to detect it. Optics are used to study very small features such as atoms and very large objects such as galaxies. Originally optics for both purposes were made of glass.
3. When light passes from one medium to another it often bends. What is this bending called?

Refraction makes it appear that an object is bent because the speed of light is different in two materials with different indices of refraction.
4. What type of electromagnetic waves can have wavelengths on the order of meters?

TV and radio waves are on the long end of the EM spectrum. They can be meters long. Since wavelength is inversely proportional to energy, these are the lowest energy waves. On the other end of the spectrum are x-rays and gamma rays, which have short wavelength and high energy.

X-rays are waves that are energetic enough to pass through the human body, but are less harmful than gamma rays. Microwaves and ultrasound have longer wavelengths and thus are less energetic.
6. How do microwaves cook food?

The microwaves have just the right energy to causes stretching of the bonds in water molecules. This stretching and the resulting relaxation releases energy in the form of heat.
7. What is another name for heat?

Infrared is so named because it has waves just longer than the visible spectrum, whose longest wavelengths are perceived by the human eye as the color red. Ultraviolet is on the other end of the spectrum, has waves short than the color violet.
8. What is the quantity that is the rate that a body radiates per unit time?

Luminance is luminosity in a given direction.
9. What is the speed of light in the centimeter-gram-second(cgs)system?