Sound Waves & Pressure

Brandi plays the piano. When she presses the middle of her piano, a sound with a frquency of 261.6 Hz is produced. The lowest note her piano has a frequency of is 27.5 Hz and the highest not has a frequency of 4,186 Hz. Which of these frequencies will travel with the fastest speed?

• 261.6 Hz

• 27.5 Hz

• 4186 Hz

• They will all travel the same speed

Hayden is an excellent singer. She sings a song that focuses on sounds at frequencies of 327 Hz, 946 Hz and 1,890 Hz. Which of these frequencies will reach the audiences ears first.

• 327 Hz

• 946 Hz

• 1890 Hz

• All the frequencies travel at the same speed

As sound wavelength become shorter, their frequencies become higher.

• True

• False

The band was playing while the door was shut. Mrs. Danielson was in her room teaching. Mrs. Danielson's class was able to hear the band playing. Explain how the sound transferred from the instruments to the Mrs. Danielson's students' eardrums.

• The instruments created vibrations in the air.

• Vibrations in the air created vibrations in the door's matter.

• The vibrations in the door caused the air on the other side of door to vibrate.

• The vibrations continued to travel down the hall until they reached the students' ears.

Only vibrations in the air are able to produce sound.

• True

• False

A sound wave traveling through the air enters a body of water. What effect will this have on the sound?

• The sound's speed will change.

• The sound's wavelength will change.

• The sound's frequency will change.

• The sound's speed and wavelength will change.

Cali is playing piano. Key 1 produces a sound that has a wavelength of 1 meter, key 2 produces a sound that has a wavelength of 2 meters, and key 3 produces a sound that has a wavelength of 3 meters. If Cali presses all 3 keys at the same time for a chord, which of the following is most likely true.

• All three sounds will reach Cali's ears at the same time.

• Sound 1 will reach Cali's ears first.

• Sound 3 will reach Cali's ears last.

• Sound 3 will reach Cali's ears first.

Describe the difference in the pitch of sounds generated by a semi generating a low frequency and a semi generating a high frequency.

• The sound produced by the semi generating low frequency will be low in pitch.

• The sound produced by the semi generating low frequency will be high in pitch.

• The sound produced by the semi generating high frequency will be low in pitch.

• The sound produced by the semi generating high frequency will be high in pitch.

One semi is generating a low frequency and another semi is generating a high frequency. Describe how the wavelengths between the two sounds would differ.

• The semi with the low frequency will have longer wavelengths.

• The semi with the low frequency will have shorter wavelengths.

• The semi with the high frequency will have longer wavelengths.

• The semi with the high frequency will have shorter wavelengths.

In which of the following would the atoms or molecules have the greatest attraction towards each other?

• Nitrogen gas

• Liquid water

• Iron

• Vinegar