Electromagnetic waves are transverse waves with a wide range of properties and uses. Some of the waves are also hazardous to human body tissues.
Which statement concerning electromagnetic waves is true?
They are transverse and all travel at the same speed in a vacuum
They are longitudinal and travel at different speeds
They are transverse and all have the same energy
What happens to the frequency and wavelength of electromagnetic waves as the wave energy increases from radio to gamma?
The wavelength and the frequency both increase
The wavelength increases and the frequency decreases
The wavelength decreases and the frequency increases
Which of these pairs of electromagnetic waves are used to cook food?
Microwaves and infrared rays
Radio waves and ultraviolet waves
Microwaves and X-rays
Which of these statements is true regarding visible light?
Visible light makes up a large proportion of the electromagnetic spectrum and has a wide range of frequencies.
Visible light is detected by the eye and makes up a limited range of frequencies in the electromagnetic spectrum.
Visible light is a longitudinal wave that travels at the speed of light.
Which of these statements about ultraviolet radiation is NOT true?
Ultraviolet radiation is used to cook food.
Ultraviolet radiation can kill bacteria in water to make it safe to drink.
Ultraviolet radiation can be good for the skin.
Which of the following are most harmful to body tissue?
Radio waves, microwaves and infrared
Microwaves, infrared and visible light
Ultraviolet rays, X-rays and gamma rays
Which part of the atmosphere can radio waves bounce off to travel further around the Earth?
Which of these statements about Infrared is not true?
Infrared cannot be seen by the human eye
Infrared is emitted by electrical heaters
Infrared is detected by radios
At what speed do electromagnetic waves travel through a vacuum?
Which electromagnetic wave has the longest wavelength and the lowest frequency?