Module1.1

Question 1

What is a wave?

Answer 1

A disturbance away from the average condition

Question 2

When does wave imply?

Answer 2

When something changes in a periodic or regular manner

Question 3

What changes in corrugated iron as we move along the sheet?

Answer 3

Physical shape and orientation of the metal changes its position in space

Question 4

What changes in the case of pendulum?

Answer 4

Position of the arm in time

Question 5

What is A in p=A sin(2ㅠx/ㅅ)?

Answer 5

Amplitude

Question 6

What is ㅅ in p=A sin(2ㅠx/ㅅ)?

Answer 6

Wavelength

Question 7

What is p in p=A sin(2ㅠx/ㅅ)?

Answer 7

Disturbance or variation

Question 8

What symbolises

1. frequency
2. angular frequency
3. Period

Answer 8

f
W
T

Question 9

What is wave speed

Answer 9

Represented by c
Has unit of metre per sec (m/s)
Speed at which energy is transported by the wave

Question 10

What is velocity

Answer 10

Is to specify the wave speed and the direction in which the wave is travelling /vector quantity

Question 11

Air exerts () on us

Answer 11

Force

Question 12

Force/area differ?

What is force/area?

Answer 12

No constant

Pressure

Question 13

Units of pressure?

Answer 13

Pa (1Pa=N/m^2)

Question 14

What is p0

Answer 14

Ambient pressure (average)

Question 15

What does p>p0 mean?

Answer 15

The fluid is compressed

Question 16

What is p

Answer 16

The fluid is rarefied

Question 17

What is general term for amplitude?

Answer 17

Magnitude

Question 18

What is the maximum excursion of an atom from its average position

Answer 18

Displacement

Question 19

What is related to the square of the pressure amplitude but depends on the frequency as well? (Almost zero)

Answer 19

Loudness

Question 20

What is the energy carried by the wave covering some specified area in a specified time.

Answer 20

Intensity

Question 21

How do u measure the intensity?

Answer 21

Watts per area OR mW/cm^2

Question 22

What is the energy content of the beam per second?

Answer 22

Power

Question 23

Whats the unit of power

Answer 23

Watt =J/s

Question 24

What is an average wave speed?

Answer 24

1540m/s =c

Question 25

What is the atom or the molecules that comprise the material that are vibrating about their average position called?

Answer 25

Particle

Question 26

What is it called when the sinusoidal motion of the particles have a speed and varies in a sinusoidal Fashion

Answer 26

Particle speed

Question 27

What is it called when the particles move perpendicular to the direction of wave?

Answer 27

Transverse wave

Question 28

What is it called when the particle vibrate in the direction that is at all times parallel or anti parallel to the wAve direction?

Answer 28

Longitudinal wave

Question 29

What is a line drawn to show the direction the wave is traveling?

Answer 29

Ray

Question 30

What is the representiation of the crests at some instant of time?

Answer 30

Wavefronts

Question 31

Who recognized that the wavefront in those cases where the source of the wave was extended could be determined by imagining that an extended source could be viewed as a series of point sources each generating wavefronts?

Answer 31

Christiaan huygens

Question 32

What is the circular or spherical source about one wave length apart and joining up the tangents to these elementary wavefronts?

Answer 32

Huygens’ wavelets

Question 33

Whats called when two waves of the same frequency exist in the same region of the material?

Answer 33

Interfere

Question 34

When two waves of the same frequency interfere, what happens?

Answer 34

Constructive/destructive

Question 35

What happen to two waves having amplitude A meet constructively?

Answer 35

Amplitude become 2A

Question 36

What happen to the power of 2 waves of same amplitude A when they meet? (Total constructive case)

Answer 36

4 since power and intensity is proportional to the square of the amplitude

Question 37

What is called when generally two or more waves meet and simply add up the mathematical expressions for the individual waves taking into account the relative travelling wave direction?

Answer 37

Superposition