Electromagnetic Spectrum Quiz
Questions: 16 · 10 minutes
1. An electromagnetic wave in a vacuum has a wavelength of 3 meters. Using c ≈ 3 × 10^8 m/s, what is its frequency?
100 MHz
1 MHz
300 MHz
900 MHz
2. What commonly distinguishes X-rays from gamma rays when their wavelength ranges overlap?
They are commonly classified by origin: X-rays arise from electron processes, while gamma rays arise from nuclear transitions
Gamma rays always have longer wavelengths
X-rays carry electric charge, while gamma rays do not
X-rays travel more slowly through a vacuum
3. What oscillates as an electromagnetic wave travels through empty space?
Only an electric field parallel to the direction of travel
Electric and magnetic fields perpendicular to each other and to the direction of travel
Matter particles moving back and forth through the vacuum
Pressure and density regions like those in a sound wave
4. Radio signals can bend around some buildings and hills more noticeably than visible light. What best explains this difference?
Radio photons usually have more energy than visible photons
Radio wavelengths are often comparable to the size of such obstacles, producing noticeable diffraction
Radio waves travel much more slowly through air
Radio waves ionize the air around the obstacle
5. A radio wave and a gamma ray travel side by side through a vacuum. How do their speeds compare?
They travel at the same speed
The radio wave travels faster because it has a longer wavelength
Their speeds depend on their frequencies even in a vacuum
The gamma ray travels faster because it has more energy
6. Rescuers use a thermal camera to locate a warm person in darkness. Which radiation is the camera mainly detecting?
Microwaves
Visible light
Infrared
Ultraviolet
7. If the frequency of an electromagnetic wave increases while it remains in a vacuum, what happens to its wavelength?
It decreases because frequency and wavelength are inversely related
It remains constant because the wave speed is constant
It changes only if the wave enters matter
It increases in the same proportion
8. Which sequence lists electromagnetic regions from lowest frequency to highest frequency?
Gamma rays, X-rays, ultraviolet, visible, infrared, microwaves, radio waves
Radio waves, infrared, microwaves, visible, X-rays, ultraviolet, gamma rays
Radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays
Microwaves, radio waves, visible, infrared, ultraviolet, gamma rays, X-rays
9. Which region contains photons with the greatest energy?
Infrared
X-rays
Ultraviolet
Gamma rays
10. How does red visible light compare with violet visible light in a vacuum?
Red light has a higher frequency and shorter wavelength
They have the same frequency but different energies
Red light has a longer wavelength and lower frequency
Violet light has a longer wavelength and lower photon energy
11. A sunscreen is designed primarily to reduce exposure to the radiation most associated with sunburn. Which region should it block?
Infrared
Ultraviolet
Microwaves
Radio waves
12. An airport scanner forms an image of objects inside a suitcase by using radiation that penetrates many soft materials. Which region is used in conventional luggage imaging?
Visible light
X-rays
Ultraviolet
Infrared
13. What is one important effect of the ozone layer on incoming electromagnetic radiation?
It absorbs most incoming visible light
It reflects most microwaves back into space
It absorbs much of the Sun's ultraviolet radiation
It blocks most infrared radiation from reaching the surface
14. A communications link uses electromagnetic wavelengths of a few centimeters. In the usual classroom divisions, which band is the most specific match?
X-rays
Infrared
Visible light
Microwaves
15. A television remote sends an invisible signal to a receiver across a room. Which region is typically used?
Radio waves
X-rays
Ultraviolet
Infrared
16. Which pair consists of electromagnetic regions whose photons are generally energetic enough to ionize atoms?
Radio waves and microwaves
Microwaves and infrared
Infrared and visible light
X-rays and gamma rays