8th Science Module L Unit 1 Study Guide MOD

Hamza holds his hand close to a hot surface. He can feel the infrared waves but cannot see them. What explains Hamza’s observation?

• Infrared waves have a different wavelength than visible light.

• Infrared waves are too dim for his eyes to see them.

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NGSS.MS-PS4-2

Samantha is making waves in a tub of water by pushing a block up and down at one end of the tub. She observes the properties of each of the waves. What can she say about the properties of the waves?

• Pushing harder on the block gives the waves more speed, and they will have a longer wavelength.

• Pushing harder on the block gives the waves more energy, and they will have a larger amplitude.

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NGSS.MS-PS4-1

Which statement describes how sound waves are transmitted through a medium?

• Sound waves are transferred from molecule to molecule in a medium.

• Sound waves pass through the spaces between the molecules of a medium.

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NGSS.MS-PS4-2

A hunter is using a spear to hunt for fish. The diagram shows two possible locations of a fish in the water.

Based on the diagram, where is the fish actually located and why?

• position A because light refracts as it exits the water

• position B because light refracts as it exits the water

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NGSS.MS-PS4-2

As Skylar listened to a tone, he heard its pitch go up. Which sound wave characteristic increases with pitch?

• amplitude

• frequency

Which of these will double the energy of a wave?

• halve the frequency

• halve the wavelength

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NGSS.MS-PS4-1

Which pictures show examples of mechanical waves?

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NGSS.MS-PS4-2

NGSS.MS-PS4-1

Spectrophotometer Design

A spectrophotometer is a device that measures the amount of light absorbed by a sample. The diagram shows the design of one type of spectrophotometer. In this device, a prism separates light into different wavelengths. A slit allows only one wavelength to pass through. The prism can be rotated to select different wavelengths to pass through the slit. The beam of light is split into two beams using a beam splitter. One of the two resulting beams is used as a reference. The other beam hits the sample where it is either transmitted or absorbed. A scientist can compare the light that passes through the sample to the reference, and see how much of the light was absorbed. Spectrophotometers are used by chemists, astronomers, and physicists to help identify materials.

A scientist wants to see if a sample absorbs ultraviolet light. What is true about the beam she is using?

• The beam of light would look blue.

• The beam of light would not be visible to humans.

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NGSS.MS-PS4-2

NGSS.MS-PS4-1

Spectrophotometer Design

A spectrophotometer is a device that measures the amount of light absorbed by a sample. The diagram shows the design of one type of spectrophotometer. In this device, a prism separates light into different wavelengths. A slit allows only one wavelength to pass through. The prism can be rotated to select different wavelengths to pass through the slit. The beam of light is split into two beams using a beam splitter. One of the two resulting beams is used as a reference. The other beam hits the sample where it is either transmitted or absorbed. A scientist can compare the light that passes through the sample to the reference, and see how much of the light was absorbed. Spectrophotometers are used by chemists, astronomers, and physicists to help identify materials.

A scientist uses the spectrophotometer to measure the amount of light that passes through a sample. The graph shows the wave that she observes at Detector 1.

Which wave may she detect at Detector 2?

• 
• 

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NGSS.MS-PS4-2

NGSS.MS-PS4-1

How do we see color?

• It is the light wave(s) reflected to our eye

• It is the wave absorbed by the object

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