Speed of Waves in Different Media

The aluminum allows the sound wave to travel faster than air at 68 degrees because the molecules in aluminum are closer together.

• This statement is true because solids are more dense than gases. Mechanical waves require a medium. The closer the molecules are, the quicker they can transfer the sound wave.

• This statement is true because solids are less dense than gases. Mechanical waves require a medium. The closer the molecules are, the quicker they can transfer the sound wave.

• This statement is true because solids are more dense than gases. Mechanical waves do NOT require a medium. The closer the molecules are, the quicker they can transfer the sound wave.

• This statement is true because solids are more dense than gases. Mechanical waves do NOT require a medium. The farther apart the molecules are, the quicker they can transfer the sound wave.

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NGSS.MS-PS4-2

According to the data, which media does light travel fastest through?

• Air because it has the highest refractive index which means it is the most dense. The denser a medium is the faster the light wave will travel.

• Air because it has the lowest refractive index which means it is the least dense. The less dense a medium, the faster the light wave will travel.

• Diamond because it has the lowest refractive index which means it is the least dense, which means the wave will move the fastest.

• Diamond because it has the highest refractive index which means it is the most dense. The denser a medium is the faster the light wave will travel.

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Which two media does light waves travel the same in?

• Air and Water because it travels at 300,000,000 m/s through these media.

• Water and Perspex because it travels at 230,000,000 m/s through these media.

• Perspex and Glass because it travels at 230,000,000 m/s through the media.

• Glass and Diamond because it travels at 242,000,000 m/s through the media.

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NGSS.MS-PS4-2

Light waves travels fastest through the air because air is a gas, which means it is less dense than the other media, which are solids and liquids.

• true

• false

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In general, sound waves travel the fastest in __________

• solid

• liquid

• Gas

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NGSS.MS-PS4-2

In General Sound waves travel the fastest in __________

• solid

• liquid

• Gas

• plasma

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Light travels slower in the Perspex than in the water because Perspex is more dense than the water, meaning it has more molecules that are attempting the block the light waves from passing through.

• True

• False

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NGSS.MS-PS4-1

NGSS.MS-PS4-2

Air has more molecules than the glass, therefore, light will travel slower in the air than in the glass.

• True

• False

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NGSS.MS-PS4-1

The speed of light through water is 230,000,000 m/s per second. Refer to the data table to see the speed of a sound wave through water. What conclusion can I draw from the information?

• Waves move at the same speed regardless of the type of wave

• Mechanical waves (sound) move faster than Electromagnetic waves (liquid)

• Electromagnetic waves (light) move faster than Mechanical waves (sound)

• There is not enough data to answer the question

Roughly what is the speed of sound in air?

• About 350 m/s

• About 1 500 m/s

• About 5000 m/s

• About 1800 m/s

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