Light Waves

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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Which of the following is true about waves?

• When wavelength increases frequency increases
• When wavelength decreases, frequency increases
• When wavelength decreases, frequency decreases

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What does this piece of evidence from the "What is Melanin?" article prove? (check all that apply)

• The genetic material in skin cells with more melanin absorbs less UV light from the sun.

• The genetic material in skin cells with less melanin absorbs more UV light from the sun.

• Melanin absorbs UV light from the sun, which can keep some UV light from reaching genetic material.

• UV light is attracted to skin cells.

• The genetic material in skin cells with more melanin absorbs more UV light from the sun.

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In order to see an object, light must be

• transmitted into your skin

• reflected off the object and into your eyes

• reflected off the object then off the ground then into your eyes

• absorbed by your genetic material

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In Lesson 1.2, you observed that a solar-powered toy moved when you shined a flashlight on it. Select all of the statements below that accurately explain how this happened.

• Light from the flashlight carried energy.

• There was energy in the toy that was activated by the light.

• Energy from the flashlight was absorbed by the toy.

• The flashlight absorbed energy from the toy.

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In order for light to change an object, that object must _______ the light and its energy.

• reflect

• transmit

• increase

• absorb

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When a material allows light to pass through it,

• the material reflects the light and changes

• the material absorbs the light and doesn't change

• the material transmits the light and doesn't change

• material transmits the light and changes

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How are we able to perceive an object as being the color white?

• All colors of visible light are absorbed by an object and then reflected into our eye.

• All colors of visible light are reflected off an object and then to our eye.

• All colors of visible light are absorbed by an object and no light is being reflected into our eye.

Which wave has the greatest amplitude?

• The blue wave
• The red wave

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NGSS.MS-PS4-1

Maya wonders which types of light could heat up a sheet of aluminum. The table below shows what happens when different types of light hit the aluminum.

• The X-ray light is more likely to heat up the aluminum because the X-ray light can pull energy out of the aluminum when it passes through the aluminum.

• The ultraviolet light is more likely to heat up the aluminum because the ultraviolet light bounces off the aluminum, which means that it has more energy.

• There is no way to know because they are two different types of light, and different types of light can change a material in different ways.

• Neither type of light is likely to heat up the aluminum because the aluminum does not take in energy from either the X-ray light or the ultraviolet light.

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