SCIENCE X: EM Waves and Optics

Which EM wave has the longest wavelength?

• Radiowaves

• Ultraviolet rays

• infrared waves

• gamma rays

Which describes how wavelength related to frequency?

• The longer the wavelength the higher the frequency

• The lower the frequency the shorter the wavelength

• The higher the frequency the shorter the wavelength

• The wavelength changes at constant frequency.

How do you compare the relative wavelengths (λ) of microwave, infrared and ultraviolet ray?

• Microwave has shorter λ than infrared but longer than ultraviolet

• Microwave has longer λ than infrared but shorter than ultraviolet ray

• Microwave has shorter λ than both infrared and ultraviolet ray

• Microwave has longer λ than both infrared and ultraviolet ray

What is the orientation of the components of electromagnetic waves?

• Electric and magnetic fields are parallel to each other

• Electric and magnetic fields are perpendicular to each other

• Electric and magnetic fields are both parallel to the direction of propagation

• Electric and magnetic fields are parallel but perpendicular to the direction of propagation.

What is the wavelength of this radio wave?

• 3.1 m

• 3.1 x 10-2 m

• 3.1 x 102 m

• 32.4 x 10 -2 m

Which set of electromagnetic waves is arranged according to increasing wavelength?

• Radio waves, microwaves, infrared, ultraviolet

• Infrared, ultraviolet rays, X-rays, Gamma rays

• Ultraviolet rays, visible light, infrared, microwaves

• Infrared, visible light, ultraviolet rays, radio waves

Which is NOT true about electromagnetic waves?

• EM waves travel at the speed of light

• It is a disturbance in a field that transfers energy

• Most EM waves are invisible but are detectable

• It consists of electric and magnetic waves that are parallel to each other

What can be inferred about EM wave's wavelengths, frequencies and energies?

• Wavelength is inversely proportional to frequency and energy

• Wavelength and frequency are inversely proportional to energy

• Wavelength is directly proportional to frequency and energy

• Wavelength and frequency are directly proportional to energy

Which equation shows how wavelength and frequency related?

• λ = v f

• f = v / λ

• λ = f / v

• f = v λ

What type of electromagnetic wave is used in sterilizing medical equipment?

• Infrared ray

• Gamma ray

• ultraviolet ray

• microwave