EM Waves and EM Spectrum

Who made the theoretical prediction that electromagnetic waves travel through a vacuum at the speed of light?

• Andrei Marie Ampere

• Michael Faraday

• Heinrich Hertz

• James Clerk Maxwell

Maxwell guessed that visible light was an electromagnetic wave because of its __________.

• energy

• frequency

• speed

• wavelength

Which of the following oscillating quantities made up an electromagnetic wave?

• electric and magnetic fields

• magnetic fields only

• electric fields only

• electrons only

Who first built and operated devices that could emit and detect man‑made electromagnetic radiation?

• Andrei Marie Ampere

• Michael Faraday

• Heinrich Hertz

• James Clerk Maxwell

Which condition of motion must be met with regard to a charged particle if it is in the process of emitting electromagnetic radiation?

• moves parallel to a uniform magnetic field

• moves at the speed of light

• moves at constant velocity

• moves at increasing velocity

Which of the following is correct in order of increasing frequency?

• visible, radio, ultraviolet and x‑ray

• infrared, visible, ultraviolet and gamma

• visible, gamma, ultraviolet and x‑ray

• infrared, x-ray, visible and gamma

Visible light is located between ____________________.

• infrared and ultraviolet

• x-ray and gamma

• microwave and infrared

• ultraviolet and x-ray

Of the various types of electromagnetic radiation, which is the most penetrating through all forms of matter?

• ultraviolet

• visible light

• gamma

• infrared

As an electromagnetic wave travels through free space, its speed can be increased by ____________________.

• increasing its frequency

• increasing its energy only

• increasing both its energy and momentum

• nothing will increase its speed

Temperature variation of different parts of a person’s body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?

• microwave

• infrared

• ultraviolet

• x-rays