Waves

Question 1

What does wave transfer?

Answer 1

Energy

Question 2

What do waves do not transfer?

Answer 2

Matter

Question 3

What are the waves that require material medium?

Answer 3

Mechanical waves

Question 4

What are the waves that don’t require medium?

Answer 4

Electromagnetic waves

Question 5

How do electromagnetic waves propagate?

Answer 5

Using electric and magnetic fields

Question 6

What waves travel perpendicular to the direction of propagation of waves?

Answer 6

Transverse waves

Question 7

Which waves consist of crest and trough?

Answer 7

Transverse waves

Question 8

What waves travel in the direction of propagation of waves?

Answer 8

Longitudinal waves

Question 9

What waves consist of rarefactions and compressions?

Answer 9

Longitudinal waves

Question 10

What is the formula for wave speed?

Answer 10

v = √TL/M

Question 11

Is speed in a thick string greater or thin string?

Answer 11

Thin string

Question 12

Theoretically speed of sound is?

Answer 12

281 m/s

Question 13

Experimental value of speed of sound is?

Answer 13

332 m/s

Question 14

What did Laplace corrected?

Answer 14

Temperature doesn’t remain constant during compressions and rarefactions.

Question 15

Range of frequencies dolphin hear?

Answer 15

150-150,000

Question 16

Range of frequencies bat hear?

Answer 16

1000-20,000

Question 17

Range of frequencies cat hear?

Answer 17

60-70,000

Question 18

Range of frequencies dog hear?

Answer 18

15-50,000

Question 19

Speed of sound depends upon?

Answer 19

v = ôRT/m

Question 20

Speed of sound with the wind?

Answer 20

Increases

Question 21

Speed of sound against the wind?

Answer 21

Decreases

Question 22

Resultant of simultaneous waves acting upon the same point is known as?

Answer 22

Principle of Superposition

Question 23

What is interference?

Answer 23

Two waves traveling in the same direction with same speed

Question 24

What does slightly different frequencies of waves produce?

Answer 24

Beats

Question 25

Two in phase waves meet to form?

Answer 25

Constructive interference

Question 26

Two out of phase waves meet to form?

Answer 26

Destructive interference

Question 27

What are the sources called for having phase difference constant?

Answer 27

Coherent

Question 28

For constructive interference the path difference between the waves must be?

Answer 28

Zero or integral multiple of wavelength

Question 29

For destructive interference the path difference is?

Answer 29

Odd integral multiple of wavelength/2

Question 30

The point of zero displacement on stationary waves?

Answer 30

Nodes

Question 31

The point of max. Amplitude on stationary waves?

Answer 31

Antinodes

Question 32

Points between two successive nodes are?

Answer 32

In phase with each other

Question 33

The distance between two consecutive nodes?

Answer 33

Wavelength/2

Question 34

Frequency of first mode of vibration?

Answer 34

f1 = (√TL/M)/2L

Question 35

Frequency of second mode of vibration?

Answer 35

f2 = 2(v/2L)

Question 36

What are overtones?

Answer 36

Harmonics, integral multiple of fundamental frequency

Question 37

What is Doppler effect?

Answer 37

The apparent change in frequencies of sound waves due to relative motion of the source or listener

Question 38

If the frequencies of waves increases the object is moving?

Answer 38

Towards you

Question 39

If the frequencies is decreasing, the object is moving?

Answer 39

Away from you

Question 40

What is blue shift?

Answer 40

A star is moving closer to the surface of earth

Question 41

What is red shift?

Answer 41

A star is moving away from the earth

Question 42

Formula for source moving towards the listener?

Answer 42

f' = (v/v - a)f

Question 43

Formula for source moving away from the listener?

Answer 43

f' = (v/v+a)f

Question 44

Formula for listener to move towards the stationary sound source?

Answer 44

f' = (v+b/v)f

Question 45

Formula for listener moving away from the stationary sound source?

Answer 45

f' = (v/v+b)f

Answer 46

Mono atomic 1.67 Di atomic 1.40 Poly atomic 1.29