30 Do Now Now

What is the speed of sound in air at 0 degrees Celsius?

• 331.5 m/s

• 343 m/s

• 300 m/s

• 350 m/s

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NGSS.HS-PS4-1

How does the speed of sound change with a 1 degree Celsius decrease in temperature?

• Increases by 0.6 m/s

• Decreases by 0.6 m/s

• Increases by 1.2 m/s

• Decreases by 1.2 m/s

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NGSS.HS-PS4-1

Which of the following factors affects the speed of sound in air?

• Humidity

• Temperature

• Altitude

• All of the above

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NGSS.HS-PS4-1

If the temperature is 20 degrees Celsius, what is the approximate speed of sound in air?

• 331.5 m/s

• 343 m/s

• 340 m/s

• 350 m/s

Explain how altitude affects the speed of sound.

• Higher altitude increases speed due to lower air pressure.

• Higher altitude decreases speed due to lower air pressure.

• Altitude has no effect on the speed of sound.

• Higher altitude increases speed due to higher air pressure.

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NGSS.HS-PS4-1

Calculate the speed of sound at -10 degrees Celsius.

• 325.5 m/s

• 325.9 m/s

• 327.5 m/s

• 329.5 m/s

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NGSS.HS-PS4-1

What is the primary medium through which sound propagates in the atmosphere?

• Water

• Air

• Solid

• Vacuum

Describe the relationship between temperature and the speed of sound.

• Directly proportional

• Inversely proportional

• No relationship

• Exponentially related

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NGSS.HS-PS4-1

What is the formula to calculate the speed of sound in air given the temperature in Celsius?

Why does sound travel faster in warm air compared to cold air?

• Molecules move slower in warm air.

• Molecules move faster in warm air.

• Warm air has higher density.

• Warm air has lower density.

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