Problems
practice
- Determine the loudest sound possible (the sound with the greatest pressure level) in decibels…
- in the air on the surface of the Earth
- in the ocean near the equator, 1,000 m below seal level (in the equatorial SOFAR channel)
- Normal conversation has an intensity level of around 60 dB. Determine the…
- pressure amplitude
- density amplitude
- displacement amplitude
- velocity amplitude
- acceleration amplitude
- A sound wave is traveling from the air to the water on a day when both are at 15 °C.
- How does the intensity of the sound wave in air compare to the same sound wave in water?
- By how many decibels is the sound intensity level reduced?
- Where does the excess energy go when a sound wave is incident upon an air-water interface?
Properties of air and water at 15 °C
|
air |
water |
density (kg/m3) |
1.225 |
0,999 |
speed of sound (m/s) |
0,340 |
1,497 |
- Write something completely different.
numerical
- Determine the maximum displacement of a gas molecule in the air from a 1,000 Hz tone with an intensity of…
- 1 pW/m2 (threshold of sensation)
- 1 W/m2 (threshold of pain)
- Unlike the threshold of hearing where 20 μPa corresponds to a sound intensity level of 0 dB by definition, there is no standard value for the threshold of pain. (Assume room temperature conditions.)
- Some sources claim 20 Pa as the threshold of pain.
- How many decibels is this?
- Determine the corresponding intensity.
- Some sources claim 1 W/m2 as the threshold of pain.
- Determine the corresponding pressure amplitude.
- How many decibels is this?
- What pressure level in decibels corresponds to a maximum dynamic pressure of…
- one atmosphere
- one thousandth of an atmosphere
- one millionth of an atmosphere
- one billionth of an atmosphere
- one trillionth of an atmosphere
- Determine the loudest sound possible (the sound with the greatest pressure level) in decibels in the atmosphere on the surface of Mars.