4.5 - Speed & Intensity of Sound

Sound travels FASTEST through which of these materials?

• Air
• Empty space
• Metal
• Water

Why does sound travel faster in solids than in liquids or gases.

• They are harder.

• Solids are more dense.

• Solids have more energy.

• Gases fill their container.

______ is the amount of energy transferred across an area in a certain time and influences how far sounds can be heard.

• Loudness

• Intensity

• Volume

• Perception

Human perception of relative sound intensity

• Amplitude

• Decibels

• Wavelength

• Frequency

The two most intense parts of a longitudinal wave.

The areas where molecules are compressed or expanded

• Compression

• Crest

• Trough

• Rarefaction

A sound wave has a wavelength of 200 m and a frequency of 6 Hz. What is its speed?

• 1200 m/s

• 12,280 m/s

• 0.0031 m/s

• 1993.8 m/s

• none of these are correct

The speed of sound in air is 340 m/s. The frequency of the sound waves generated by my voice is 720 Hz. Calculate the wavelength of sound of my voice.

• 380 m

• 0.472 m

• 2.11 m

• 244,800

• none of these are correct

What part of the wave is a compression? 

• A
• B

What part of the wave is a rarefaction? 

• A
• B

A wave has frequency of 5 Hz and a speed of 25 m/s. What is the wavelength of the wave?

• 25 m

• 125 m

• 5 m

• 25 m/s