Amplify Light Waves

Aniyah has a special type of paper that can permanently change color. She wonders whether light can cause the paper’s color to change. The table below shows what happens when different types of light hit the paper. Based on this information, which type of light can cause the paper to change color?

• The infrared light can cause the paper to change color.

• The X-ray light can cause the paper to change color.

• The ultraviolet light can cause the paper to change color.

• Any of these types of light can cause the paper to change color, because all light carries energy that can cause materials to change.

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NGSS.HS-PS4-3

The appearance of an object changes under different colors of light

• True

• False

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NGSS.MS-PS4-2

What is the primary function of a laser in amplifying light waves?

• To increase the frequency of light

• To increase the amplitude of light

• To increase the coherence of light

• To increase the speed of light

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NGSS.HS-PS4-5

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

• The optical cavity

• The gain medium

• The power supply

• The cooling system

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NGSS.HS-PS4-3

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

• More electrons in the ground state than in the excited state

• Equal number of electrons in the ground and excited states

• More electrons in the excited state than in the ground state

• No electrons in the excited state

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NGSS.HS-PS4-3

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

• Solar panels

• Fiber optic communication

• Photosynthesis

• Thermal imaging

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NGSS.HS-PS4-5

What is the role of the optical cavity in a laser?

• To focus the light waves

• To amplify the light waves

• To reflect and sustain the light waves

• To change the color of the light waves

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NGSS.HS-PS4-3

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

• Glass

• Water

• Ruby

• Plastic

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-PS4-3

How does a laser differ from a regular light bulb in terms of light emission?

• Laser emits incoherent light, while a bulb emits coherent light

• Laser emits coherent light, while a bulb emits incoherent light

• Both emit coherent light

• Both emit incoherent light

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NGSS.HS-PS4-3