EM Wave Produced

Which one of the following statements concerning electromagnetic waves is false?

• Electromagnetic waves are longitudinal waves.

• Electromagnetic waves transfer energy through space.

• The existence of electromagnetic waves was predicted by Maxwell.

• Electromagnetic waves can propagate through a material substance.

• Electromagnetic waves do not require a physical medium for propagation.

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NGSS.HS-PS4-3

Note the different types of electromagnetic radiation: (1) X-rays (4) visible light

(2) radio waves (5) infrared radiation

(3) gamma rays (6) ultraviolet radiation

Which list correctly ranks the electromagnetic waves in order of increasing frequency?

• 2, 3, 4, 5, 6, 1

• 2, 5, 4, 1, 6, 3

• 2, 5, 4, 6, 1, 3

• 3, 1, 6, 4, 5, 2

• 3, 6, 1, 4, 5, 2

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NGSS.HS-PS4-1

Which one of the following will not generate electromagnetic waves or pulses?

• a steady direct current

• an accelerating electron

• a proton in simple harmonic motion

• an alternating current

• charged particles traveling in a circular path in a mass spectrometer

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NGSS.HS-PS4-3

NGSS.HS-PS4-5

Complete the following sentence: When electrons from a heated filament accelerate through vacuum toward a positive plate,

• only an electric field will be produced.

• only a magnetic field will be produced.

• electromagnetic waves will be produced.

• longitudinal waves will be produced.

• neither electric nor magnetic fields will be produced.

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NGSS.HS-PS4-3

Which one of the following wavelengths is in the infrared range of the electromagnetic spectrum?

• 100 mm

• 100 nm

• 400 m

• 2 ´ 10^–15 m

• 20 µm

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NGSS.HS-PS4-1

Which one of the following statements concerning electromagnetic waves is false?

• Electromagnetic waves carry energy.

• X-rays have longer wavelengths than radio waves.

• In vacuum, all electromagnetic waves travel at the same speed.

• Lower frequency electromagnetic waves can be produced by oscillating circuits.

• They consist of mutually perpendicular electric and magnetic fields that oscillate perpendicular to the direction of propagation.

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NGSS.HS-PS4-1

NGSS.HS-PS4-5

Which one of the following statements concerning the wavelength of an electromagnetic wave in a vacuum is true?

• The wavelength is independent of the speed of the wave for a fixed frequency.

• The wavelength is inversely proportional to the speed of the wave.

• The wavelength is the same for all types of electromagnetic waves.

• The wavelength is directly proportional to the frequency of the wave.

• The wavelength is inversely proportional to the frequency of the wave.

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NGSS.HS-PS4-1

When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?

• 7.1 ´ 10¹⁰ Hz

• 2.1 ´ 10¹⁴ Hz

• 3.0 ´ 10⁸ Hz

• 6.9 ´ 10¹¹ Hz

• 1.4 ´ 10⁹ Hz

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NGSS.HS-PS4-1

Complete the following sentence: The various colors of visible light differ in

• frequency only.

• wavelength only.

• their speeds in a vacuum.

• frequency and wavelength.

• frequency and their speed in a vacuum.

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NGSS.HS-PS4-1

An FM radio station generates radio waves that have a frequency of 95.5 MHz. The frequency of the waves from a competing station have a frequency of 102.7 MHz. What is the difference in wavelength between the waves emitted from the two stations?

• 0.22 m

• 0.45 m

• 0.84 m

• 2.4 m

• 42 m

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NGSS.HS-PS4-1