Midterm 7th Grade

Question 0

Crest

Answer 0

The highest point of a transverse wave

Question 1

Wave

Answer 1

A disturbance that transfers energy from place to place.

Question 2

Longitudinal wave

Answer 2

A wave that moves the medium parallel to the direction in which the wave travels. This wave is also how sound travels.

Question 3

Amplitude

Answer 3

The maximum distance the particles of a medium move away from their resting positions as a wave passes through the medium.

Question 4

Wavelength

Answer 4

The distance between two corresponding parts of a wave.

Question 5

Speed

Answer 5

Wavelength x frequency

Question 6

Temperature of air

Answer 6

Affects sound and how far it can travel. Cooler air sound can travel farthest and in hot air sound travels less far.

Question 7

Refraction

Answer 7

The bending of waves as they enter a different medium.

Question 8

Diffraction

Answer 8

The bending of waves around a barrier or between two objects.

Question 9

Constructive interference

Answer 9

When two waves combine creating one big wave with a greater amplitude.

Question 10

Destructive interference

Answer 10

When two waves combine resulting in a lower amplitude

Question 11

Standing wave

Answer 11

A wave where some points remain fixed in place while others vibrate with maximum amplitude.

Question 12

Resonance

Answer 12

When an added frequency matches an object’s natural frequency, the object will break.

Question 13

Seismic waves

Answer 13

A wave produced by an earthquake

Question 14

Secondary wave (S-wave)

Answer 14

Transverse waves that cannot travel through liquids so are not detected on the other side of Earth.

Question 15

Primary wave (P-wave)

Answer 15

Longitudinal waves that are faster and arrive first during an earthquake.

Question 16

Antinode

Answer 16

Highest and lowest parts of a standing wave.

Question 17

Medium

Answer 17

The material through which a wave travels.

Question 18

Wave classification

Answer 18

Classified by how they move

Question 19

Frequency

Answer 19

The number of complete waves that pass a given point in a certain amount of time.

Question 20

Tsunami

Answer 20

A huge surface wave in water

Question 21

Reflection

Answer 21

When a wave cannot pass through an object, it bounces off of it.

Question 22

Sound doesn’t travel through…

Answer 22

Outer space

Question 23

Elasticity

Answer 23

The ability of a material to bounce back after being disturbed.

Question 24

Loudness

Answer 24

The greater the intensity the louder the sound. Also measured in decibels.

Question 25

Pitch

Answer 25

Perception of the frequency of sound

Question 26

Doppler effect

Answer 26

The apparent change in frequency of a sound as the source moves in relation to the listener.

Question 27

Acoustics

Answer 27

The study of how well sounds can be heard in a particular room or hall.

Question 28

Ear canal

Answer 28

A narrow region leading from the outside of the human ear to the ear drum. (Where the sound first enters)

Question 29

Cochlea

Answer 29

A snail shaped tube in the inner ear lined with sound receptors; nerve impulses are sent from the cochlea to the brain.

Question 30

Causes of hearing loss

Answer 30

Infection, injury, or extensive listening to a sound that is too loud.

Question 31

Radar

Answer 31

RAdio Detection And Ranging- measures reflected radio waves.

Question 32

Echolocation

Answer 32

The use of reflected sound waves to navigate and locate prey.

Question 33

Ultrasound

Answer 33

Sound waves with frequencies above 20,000 Hz

Question 34

Sonogram

Answer 34

An image formed by an ultrasound machine.