Electromagnetic Waves - Multiple Choice Questions

Which of the following is true about all electromagnetic waves?

• They require a medium to travel

• They are longitudinal waves

• They travel at the same speed in a vacuum

• Their speed depends on their frequency

What is the speed of electromagnetic waves in a vacuum?

• 3 × 10^12 m/s

Which of the following waves has the longest wavelength?

• Gamma rays

• X-rays

• Infrared

• Radio waves

Which part of the electromagnetic spectrum has the highest energy?

• Ultraviolet

• Gamma rays

• Visible light

• Radio waves

Which type of electromagnetic wave is used in night vision cameras?

• Infrared

• Ultraviolet

• X-rays

• Microwaves

Which of the following is a property of X-rays?

• They can be detected by the human eye

• They have a longer wavelength than microwaves

• They are absorbed by bones but pass through soft tissue

• They travel slower than visible light

Which electromagnetic wave has a frequency just higher than visible light?

• Infrared

• Ultraviolet

• Microwaves

• Radio waves

Which electromagnetic waves are used for satellite communication?

• Infrared

• Microwaves

• Gamma rays

• Ultraviolet

Which type of electromagnetic wave is commonly used for sterilising medical equipment?

• Ultraviolet

• Infrared

• Visible light

• Microwaves

Which of the following is NOT a use of radio waves?

• Broadcasting TV signals

• Mobile phone communication

• Treating cancer

• FM radio transmission