These graphs show the wavelength and amplitude of light coming from three lasers. Could any of these lasers be giving off a different type of light?

• Yes. Laser 2 could be giving off a different type of light because Laser 2 has a different wavelength than Lasers 1 and 3.

• Yes. Laser 3 could be giving off a different type of light because Laser 3 has a different amplitude than Lasers 1 and 2.

• Yes. All three lasers must be giving off different types of light because every light source gives off its own type of light.

• No. All three lasers must be giving off the same type of light because all three are lasers, and the same kind of light source gives off the same type of light.

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NGSS.HS-PS4-1

What is the principle behind the amplification of light waves in a laser?

• Stimulated emission

• Spontaneous emission

• Absorption

• Reflection

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

Which component in a laser is responsible for amplifying light waves?

• Optical cavity

• Lens

• Prism

• Diffraction grating

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NGSS.HS-PS4-5

In the context of light amplification, what does the term 'population inversion' refer to?

• More electrons in excited states than in lower energy states

• Equal number of electrons in excited and lower energy states

• More electrons in lower energy states than in excited states

• No electrons in excited states

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NGSS.HS-PS4-3

Which of the following is a common application of amplified light waves?

• Laser cutting

• Radio broadcasting

• Ultrasound imaging

• Magnetic resonance imaging

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NGSS.HS-PS4-5

What is the role of a gain medium in a laser?

• To amplify light by stimulated emission

• To focus light

• To reflect light

• To absorb light

How does a laser differ from ordinary light sources in terms of light wave properties?

• Laser light is coherent and monochromatic

• Laser light is incoherent and polychromatic

• Laser light is incoherent and monochromatic

• Laser light is coherent and polychromatic

What is the significance of the term 'coherence' in laser light?

• Waves are in phase

• Waves are out of phase

• Waves have different frequencies

• Waves have different amplitudes

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NGSS.HS-PS4-3

NGSS.HS-PS4-5

Which of the following materials can be used as a gain medium in a laser?

• Ruby

• Glass

• Plastic

• Wood

What is the function of mirrors in a laser setup?

• To reflect light back and forth to amplify it

• To absorb excess light

• To focus light into a beam

• To disperse light into a spectrum

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NGSS.HS-PS4-5