WAVES

Question 1

what is a crest?

Answer 1

The crest of a wave is a top or peak of the wave

Question 2

what is trough

Answer 2

The lowest point of the wave

Question 3

what is amplitude

Answer 3

the maximum displacement or distance moved by a point on a vibrating body or wave from its equilibrium (or rest) position

Question 4

Define wave.

Answer 4

A disturbance that transfers energy through space or matter.

Question 5

True or false: Longitudinal waves have particles that move perpendicular to wave direction.

Answer 5

FALSE

Longitudinal waves have particles that move parallel to the direction of wave travel.

Question 6

What is the wavelength?

Answer 6

The distance between two consecutive crests or troughs in a wave.

Question 7

Fill in the blank: The frequency of a wave is measured in _______.

Answer 7

Hertz (Hz)

Question 8

What type of wave is a sound wave?

Answer 8

A longitudinal wave that travels through air or other mediums.

Question 9

Define amplitude.

Answer 9

The maximum displacement of a point on a wave from its rest position.

Question 10

True or false: Transverse waves can travel through solids only.

Answer 10

TRUE

Transverse waves cannot travel through fluids; they require a medium that can support shear stress.

Question 11

What is refraction?

Answer 11

The bending of waves as they pass from one medium to another.

Question 12

Fill in the blank: Sound waves travel fastest in _______.

Answer 12

Solids

Question 13

What is the period of a wave?

Answer 13

The time taken for one complete cycle of the wave to pass a point.

Question 14

when an object is placed in water and the water ripples. What happens to the object

Answer 14

The object stays in the same place as the wave of the water does not carry any particle, but rather creates energy

Question 15

Examples of transverse waves

Answer 15

s-waves
electromagnetic waves
waves in water

Question 16

what is frequency

Answer 16

number of waves that pass a point

Question 17

Explain how to measure the speed of sound

Answer 17

We need two microphones and an oscilloscope.
Connect the microscopes to the oscilloscope and move one of them until the two waves are aligned. A speaker can be connected to a signal generator that produces a specific frequency. The distance between the two microphones is the wavelength.

Question 18

describe the effects of and what is transmission

Answer 18

Transmission occurs when a wave passes through an object rather than being reflected or absorbed. This can sometimes lead to refraction

Question 19

what is refraction

Answer 19

It is when a wave enters a different boundary, and it either slows down or speeds up. As a result, it changes direction

Question 20

Explain how waves will be refracted at a boundary in terms of
the change of direction and speed

Answer 20

When a wave enters a denser medium (like light from air into glass), it slows down and bends towards the normal (a line perpendicular to the boundary). When it enters a less dense medium (like from glass back into air), it speeds up and bends away from the normal. The wave only changes direction if it hits the boundary at an angle; it will not change direction if it hits perpendicular to the boundary

Question 21

what cause sound

Answer 21

vibrations

Question 22

what are infrasound waves

Answer 22

sound wave with frequencies less than 20HZ

Question 23

what are ultrasound

Answer 23

sounds with frequencies more than 20,000 HZ

Question 24

What affects an object’s ability to transmit given frequencies of sound

Answer 24

density
resonance
thickness
damping