Sound

Front 1

On which medium does sound travel fast?

Back 1

Solid

Front 2

Sound is a ________ wave, because?

Back 2

Mechanical wave because it needs a medium to propagate.

Front 3

Sound waves are __________ waves, because?

Back 3

Longitudinal waves because it travels parallel to the motion of particles.

Front 4

Waves that travel perpendicular to the direction of the waves

Back 4

Transverse waves

Front 5

Waves that travel as compression, and parallel to the direction in which waves are traveling

Back 5

Longitudinal waves

Front 6

Areas where particles are momentarily close

Back 6

Compression

Front 7

Areas where particles are momentarily far apart

Back 7

Rarefaction

Front 8

The size of compression indicates?

Back 8

The amount of energy the sound wave has.

Front 9

Sound waves with large compressions has?

Back 9

High energy

Front 10

Sound waves with small compression has?

Back 10

Low energy

Front 11

Amplitude of a wave is related to?

Back 11

The energy which it transports.

Front 12

What is the lowest part of a transverse wave?

Back 12

Trough

Front 13

What is the highest part of a transverse wave?

Back 13

Crest

Front 14

Draw a transverse wave with labels

Back 14

Back (Definition)

Front 15

Waves are carriers of?

Back 15

Energy

Front 16

Waves does not transfer?

Back 16

Matter

Front 17

Speed of sound in Air

Back 17

331 m/s

Front 18

Speed of sound in Helium

Back 18

1005 m/s

Front 19

Speed of sound in Hydrogen

Back 19

1300 m/s

Front 20

Speed of sound in Water

Back 20

1440 m/s

Front 21

Speed of sound in Seawater

Back 21

1560 m/s

Front 22

Speed of sound in Iron and Steel

Back 22

5000

Front 23

Speed of sound Aluminum

Back 23

5100

Front 24

Speed of sound in Hard wood

Back 24

4000 m/s

Front 25

This property is the tendency of a material to maintain its shape and not deform

Back 25

Elastic property

Front 26

Sound travels faster in mediums with higher elastic properties than?

Back 26

Solids like rubber which have lower elastic properties.

Front 27

The motion of a transverse wave is?

Back 27

At a right angle to the direction of a wave

Front 28

The motion of a longitudinal wave is?

Back 28

The same direction as the wave

Front 29

High or low

Back 29

Pitch

Front 30

Intensity

Back 30

Loud or soft

Front 31

The height of wave from the black line

Back 31

Amplitude

Front 32

The distance between two identical points on the curve

Back 32

Wavelength

Front 33

Number of waves traveling past a point

Back 33

Frequency

Front 34

The frequency range over which we can hear

Back 34

Audible range

Front 35

What are the audible range for children?

Back 35

20Hz - 30,000 Hz

Front 36

Loudness scale is measured by?

Back 36

Decibels (dB)

Front 37

Audible range for a dog

Back 37

67 Hz- 45,000 Hz

Front 38

Audible range for a mouse

Back 38

1000 Hz - 91,000 Hz

Front 39

Audible range for a bat

Back 39

2000 Hz - 110,000 Hz

Front 40

Audible range for a beluga whale

Back 40

1000 Hz - 123,000 Hz

Front 41

Audible range for a chicken

Back 41

125 Hz - 2,000 Hz

Front 42

What is ultrasound?

Back 42

Sound waves that have a frequency above 20,000 Hz.

Front 43

Bats use ultrasound to?

Back 43

Detect prey and navigate in dim light.

Front 44

Dolphins use ultrasound to?

Back 44

Detect prey, predators, and to communicate.

Front 45

Ultrasound in observing unborn babies

Back 45

Can image a child in the womb to check their condition.

Front 46

Ultrasound in observing soft tissues

Back 46

Can image the digestive track and used to break down dangerous accumulations.

Front 47

Usually described as the turning back of a wave as it hits a barrier.

Back 47

Reflection

Front 48

An example of a reflected sound

Back 48

Echo

Front 49

Refers to the multiple reflections or echoes in a certain place.

Back 49

Reverberation

Front 50

A reverberation usually occurs in a small room with what height?

Back 50

17 meters or less

Front 51

How do scientists use echoes on oceans or seas?

Back 51

To map the sea floor and to determine the depth of the ocean or sea.

Front 52

Why are concerts usually held at nighttime?

Back 52

Sound is heard better in far areas during nighttime than in daytime. This happens because of refraction. The Earth’s surface is cooler above during daytime, then the sound would move towards the cooler region. Thus, sound will be refracted to the sky. At nighttime, the air in the Earth’s surface is heated by the heat emitted by the ground. Since sound travels faster in hotter mediums, concerts are held at nighttime as sound waves are refracted from the stage towards the audience.

Front 53

The change in speed of sound when it encounters a medium of different density.

Back 53

Refraction

Front 54

Sound travels in fast in what temperature?

Back 54

Hotter temperatures

Front 55

Waves that travel as compression, and parallel to the direction of the waves

Back 55

Longitudinal waves