Read About It Electromagnetic Waves

What is the speed of electromagnetic waves in a vacuum?

• 300,000 kilometers per second

• 150,000 kilometers per second

• 186,000 miles per second

• 200,000 miles per second

Which of the following is NOT a characteristic of electromagnetic waves?

• They require a medium to travel.

• They are transverse waves.

• They travel at the speed of light.

• They can travel through empty space.

What happens to light when it passes through a prism?

• It bends and separates into different colors.

• It is absorbed completely.

• It reflects back in the same direction.

• It speeds up.

Which electromagnetic wave has the longest wavelength?

• Radio waves

• Infrared

• Visible light

• Ultraviolet

What is the main function of the ozone layer in relation to electromagnetic waves?

• It blocks most UV radiation from reaching Earth's surface.

• It reflects visible light back into space.

• It absorbs all infrared radiation.

• It enhances the transmission of radio waves.

Which part of the electromagnetic spectrum is used in thermal imaging devices?

• Infrared

• Ultraviolet

• X-rays

• Gamma rays

What determines the color of visible light?

• Wavelength

• Amplitude

• Frequency

• Speed