Sound

Question 0

The speed of sound is different in different (blank).

Answer 0

materials, mediums, and temperatures

Question 1

The speed of (blank) is different in different materials, mediums, and temperatures.

Answer 1

sound

Question 2

Sound travels at a speed of (blank) m/s in air at 0 degrees Celsius and 1 atm.

Answer 2

331.4

Question 3

Sound travels at a speed of 331.4 m/s in air at 0 degrees (blank) and 1 atm.

Answer 3

Celsius

Question 4

In fresh water, speed of sound will travel (blank) m/s.

Answer 4

1440

Question 5

In (blank) water, speed of sound will travel 1440 m/s.

Answer 5

fresh

Question 6

In salt water, speed of sound will travel (blank) m/s.

Answer 6

1560

Question 7

In (blank) water, speed of sound will travel 1560 m/s.

Answer 7

salt

Question 8

Loudness is related to the (blank) in the sound wave.

Answer 8

intensity

Question 9

The physical quantity that determines pitch is the (blank).

Answer 9

frequency

Question 10

The audible range of the average human ear is (blank) Hz to (blank) Hz.

Answer 10

20; 20,000

Question 11

Frequencies above 20,000 Hz are termed (blank).

Answer 11

ultrasonic

Question 12

(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.

Answer 12

Autofocusing cameras

Question 13

Sound waves whose frequencies are below the audible range are termed (blank).

Answer 13

intrasonic

Question 14

Intensity is defined as the (blank) transported by a wave per unit time across a unit area perpendicular to the energy flow.

Answer 14

energy

Question 15

Intensity is defined as the energy transported by a wave per unit time across a unit area (blank) to the energy flow.

Answer 15

perpendicular

Question 16

An average human ear can detect sounds with an intensity as low as (blank) W/m^2.

Answer 16

10^-12

Question 17

The unit on this scale is termed a (blank)

Answer 17

bel, or more commonly, the decibel (dB)

Question 18

The threshold of pain as an intensity is (blank) dB.

Answer 18

120

Question 19

The middle ear consists of which three small bones?

Answer 19

hammer, anvil, and stirrup

Question 20

The (blank) is where the vibrational energy of sound waves is transformed into electrical energy and sent to the brain.

Answer 20

cochlea

Question 21

One (blank) corresponds to a doubling of frequency.

Answer 21

octave

Question 22

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.

Answer 22

Doppler effect

Question 23

What are three applications of the Doppler effect?

Answer 23

weather radars, speed radars, and ?police sirens?

Question 24

(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.

Answer 24

Sonar