# Electromagnetic Spectrum

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Electromagnetic Spectrum
Chapter 18 Study Guide Electromagnetic Spectrum

B. Wavelength and frequency
Electromagnetic Waves vary in A. the speed they travel in a vacuum B. Wavelength and frequency C. the way they reflect D. Their direction

A. wavelength To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its A. wavelength B. Intensity C. Refraction D. Amplitude

C. both wave and a particle
Light acts like A. A wave B. A particle C. both wave and a particle D. neither a wave nor a particle.

B. a stream of particles Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light is A. radiation B. a stream of particles C. a wave D. heat

d. Farther from the source, photons spread over a larger area.
Which of the following occurs as light travels farther from its source? a. Far from the source, photons spread through a small area. b. The intensity of light increases as photons move away from the source. c. The source gives off less light as photons move away from it. d. Farther from the source, photons spread over a larger area.

c. radio waves. Infrared rays have a shorter wavelength than
a. ultraviolet rays. c. radio waves. b. X-rays. d. gamma rays.

c. the electromagnetic spectrum.
The full range of frequencies of electromagnetic radiation is called a. visible light. c. the electromagnetic spectrum. b. radio waves. d. invisible radiation.

b. radio waves. The waves with the longest wavelengths in the electromagnetic spectrum are a. infrared rays. c. gamma rays. b. radio waves. d. X-rays.

c. infrared rays and ultraviolet rays.
The visible light spectrum ranges between a. radar waves and X-rays. c. infrared rays and ultraviolet rays. b. television waves and infrared rays. d. ultraviolet rays and gamma rays.

d. microwaves. Cellular telephones utilize a. radar waves.
c. very low frequency waves. b. very high frequency waves. d. microwaves.

b. as dark, highly exposed areas.
X-ray photographs show softer tissue a. as invisible. c. the same as dense bones. b. as dark, highly exposed areas. d. as bright white areas.

a. scatters some light. A translucent material a. scatters some light.
c. absorbs all light. b. transmits all light. d. reflects all light.

c. opaque-translucent-transparent
In order of the light-transmitting capabilities of materials from none to all, which is the correct sequence? a. transparent-opaque-translucent c. opaque-translucent-transparent b. opaque-transparent-translucent d. translucent-transparent-opaque

b. refraction Which of the following occurs as a light wave bends when it passes from one medium into another? a. constructive interference c. destructive interference b. refraction d. reflection

c. all the colors of the visible spectrum.
Newton’s prism experiments showed that white sunlight is made up of a. the full electromagnetic spectrum. c. all the colors of the visible spectrum. b. only blue light when separated by a prism. d. only the longest wavelengths.

d. dispersion. When droplets of water in the atmosphere act like prisms, the colors in sunlight undergo a. interference. c. polarization. b. absorption. d. dispersion.

a. color of the object. What an object is made of and the color of light that strikes it determines the a. color of the object. c. opacity of the object. b. transparency of the object. d. translucence of the object.

d. blue, green, and red. The primary colors of light are
a. green, blue, and black. c. red, yellow, and blue. b. cyan, magenta, and yellow. d. blue, green, and red.

c. sodium-vapor lights. Many streets and parking lots are illuminated with a. laser lights. c. sodium-vapor lights. b. tungsten-halogen lights. d. fluorescent lights.

transverse Electromagnetic waves are ____________________ waves consisting of changing electric and magnetic fields.

infrared Warm objects give off more ____________________ radiation than cool objects give off.

300,000,000 The speed of light in a vacuum is ____________________ m/s.

red When viewed in red light, an object that reflects all the colors of light will appear ____________________.

vacuum Electromagnetic waves can travel through a(an) ____________________.

wavelengths Visible light waves have a shorter ____________________ than infrared waves have.

gamma The electromagnetic waves with the shortest wavelengths are ____________________ rays.

frequency wavelength White light passing through a prism separates into colors because of the differences in the ____________________ of each color of light.

Visible light The following electromagnetic waves are arranged in order of increasing frequency: infrared, _________________________, ultraviolet.

Electromagnetic waves are transverse and sound waves are longitudinal
What is a basic difference between electromagnetic waves and sound waves?

air In which medium does light travel faster, air or glass?

It’s what happens when light strikes metal.
What is the photoelectric effect?

Radio waves Which type of electromagnetic wave has the longest wavelength and lowest frequency?

X-rays take pictures of bones; gamma rays takes pictures of the brain
Both gamma rays and X-rays are used to see inside the body. Which one is used to make images of bones? How are the other rays used?

what the object is made of and the color of light striking the object
What two factors influence the color of an object?

Cheap and efficient Why do Schools and businesses uses flourescent light bulbs?

Red, orange, yellow, green, blue, indigo, violet
What are the colors of the rainbow in order from largest wavelength to smallest wavelength?

The sunlight goes through the water droplets (prisms) and then is refracted into the different colors of visible light. How does a rainbow form in nature? What is the prism?

Diffraction is when a wave passes through an opening
Diffraction is when a wave passes through an opening. Example – when you make a tiny hole in the end of your fist and look through it. What is diffraction and give an example of diffraction?

green If you shine all the visible light colors on an object and the object reflects green light, what color is the object?

You see lightning first because light is faster than sound.
Why do you see lightning before you hear thunder?