Sound Flashcards
The speed of sound is different in different (blank).
materials, mediums, and temperatures
The speed of (blank) is different in different materials, mediums, and temperatures.
sound
Sound travels at a speed of (blank) m/s in air at 0 degrees Celsius and 1 atm.
331.4
Sound travels at a speed of 331.4 m/s in air at 0 degrees (blank) and 1 atm.
Celsius
In fresh water, speed of sound will travel (blank) m/s.
1440
In (blank) water, speed of sound will travel 1440 m/s.
fresh
In salt water, speed of sound will travel (blank) m/s.
1560
In (blank) water, speed of sound will travel 1560 m/s.
salt
Loudness is related to the (blank) in the sound wave.
intensity
The physical quantity that determines pitch is the (blank).
frequency
The audible range of the average human ear is (blank) Hz to (blank) Hz.
20; 20,000
Frequencies above 20,000 Hz are termed (blank).
ultrasonic
(blank) emit a pulse of very high frequency (ultrasonic) sound that travels to the object being photographed, and include a sensor that detects the returning reflected sound. The camera focuses based on the time between emission and reception.
Autofocusing cameras
Sound waves whose frequencies are below the audible range are termed (blank).
intrasonic
Intensity is defined as the (blank) transported by a wave per unit time across a unit area perpendicular to the energy flow.
energy
Intensity is defined as the energy transported by a wave per unit time across a unit area (blank) to the energy flow.
perpendicular
An average human ear can detect sounds with an intensity as low as (blank) W/m^2.
10^-12
The unit on this scale is termed a (blank)
bel, or more commonly, the decibel (dB)
The threshold of pain as an intensity is (blank) dB.
120
The middle ear consists of which three small bones?
hammer, anvil, and stirrup
The (blank) is where the vibrational energy of sound waves is transformed into electrical energy and sent to the brain.
cochlea
One (blank) corresponds to a doubling of frequency.
octave
The (blank) is when something makes noise and moves toward an observer, and the pitch heard by the observer is higher than when the source of the sound is at rest. When the source moves away from the observer, the pitch is lower.
Doppler effect
What are three applications of the Doppler effect?
weather radars, speed radars, and ?police sirens?
(blank) uses pulse-echo technique. A transmitter sends out a sound pulse through the water, and a detector receives its reflection, or echo, a short time later. Measuring the time the sound takes to come back, the distance to the reflecting object can be determined.
Sonar
