Electromagnetic Radiation

Radio waves are:

• short wavelength electromagnetic waves.

• short wavelength sound waves.

• long wavelength electromagnetic waves.

• long wavelength sound waves.

Electromagnetic radiation is classified as a transverse wave because:

• it travels through a vacuum.

• it travels at the speed of light.

• the electric and magnetic waves are perpendicular to each other.

• the vibrations are perpendicular to the direction of propagation.

A radio wave:

1) travels at the speed of sound.

2) is received by a radio which increases the amplitude of

the wave.

3) is low energy electromagnetic radiation.

Which of these statements is TRUE?

• 1 only.

• 1 and 2 only.

• 2 and 3 only.

• 3 only.

The dual nature of electromagnetic radiation applies to:

• all electromagnetic radiation all the time.

• only electromagnetic frequencies above those of infrared radiation all of the time.

• all electromagnetic radiation when it interacts with materials such as metals.

• visible light only all of the time because its particles are called photons.

which of the following lists shows EMR correctly arranged in order of increasing frequency?

• gamma rays, X-rays, microwaves, radio waves.

• X-rays, gamma rays, microwaves, radio waves.

• microwaves, radio waves, X-rays, gamma rays.

• radio waves, microwaves, X-rays, gamma rays.

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Which of the following types of EMR is used to send a signal from a TV remote control device to change the channel on a TV?

• radio waves

• microwaves

• infrared

• X-ray

X-Rays and Ultrasound are useful medical diagnostic tools. Both these technologies are similar to one another in that they both:

• use EMR.

• are non-invasive imaging technologies.

• safe to use in examining infants and adults.

• require technicians to wear safety and protective clothing when operating the machines.

Which of the following occurs when the wavelength and the amplitude of EMR passing through a vacuum, is increased?

• The frequency decreases and the intensity increases.

• The frequency and the intensity increases.

• The frequency and the intensity decreases.

• The frequency increases and the intensity decreases.

Which of the following affects the energy of the photons of EMR?

• amplitude

• period

• frequency

• the medium through which it passes.

A boy falls off his skateboard and breaks his arm.What type of radiation would be used to look at his arm and determine whether its broken or not?

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