Electromagnetic Waves and Their Properties

What is the primary difference between mechanical waves and electromagnetic waves?

• Mechanical waves require a medium to travel, while electromagnetic waves do not.

• Electromagnetic waves require a medium to travel, while mechanical waves do not.

• Neither requires a medium to travel.

• Both require a medium to travel.

How does changing the frequency of visible light affect its properties?

• It changes the intensity of the light.

• It changes the direction of the light.

• It changes the color of the light.

• It changes the speed of light.

What is the approximate speed of light in a vacuum?

• 340 meters per second

• 299 million meters per second

• 150 million kilometers per second

• 3 times 10^8 meters per second

How long does it take for light from the Sun to reach Earth?

• About 8.3 days

• About 8.3 hours

• About 8.3 minutes

• About 8.3 seconds

Which type of electromagnetic wave is most commonly associated with nuclear decay?

• Infrared rays

• Gamma rays

• X-rays

• Ultraviolet rays

Why are x-rays considered potentially dangerous?

• They can cause temporary blindness.

• They can disrupt electronic devices.

• They can damage organs and cause mutations.

• They can cause immediate burns.

What is a common application of ultraviolet light?

• Transmitting data

• Heating food

• Medical imaging

• Tanning and black lights

Which color of visible light has the highest frequency?

• Green

• Red

• Violet

• Blue

What is a common use of infrared light in households?

• Cooking food

• Remote controls

• Medical imaging

• Tanning

Which part of the electromagnetic spectrum is used for FM radio broadcasting?

• Microwaves

• Infrared

• Radio waves

• Ultraviolet