Ch 10

Question 1

Shm

Answer 1

Occurs when the net force is directly proportional to the displacement from the mean position and is always directed towards the mean position

Question 2

Vibration

Answer 2

One complete round trip of a vibrating body about its mean position is one vib

Question 3

Time period

Answer 3

The time taken by a vibrating body to complete one vibration

Question 4

Frequency

Answer 4

The number of vibration or cycles of a vibrating body in one second .it is reciprocal of time period f=1/T

Question 5

Amplitude

Answer 5

The maximum displacement of vibration body on either side from its mean position

Question 6

Damped oscillation

Answer 6

The oscillation of a system in the presence of some resistive force

Question 7

Wave

Answer 7

Wave is a disturbance in the medium which causes the particles of the medium to undergo vibratory motion about their mean position in equal intervals of time

Question 8

Mechanical waves

Answer 8

Waves which require any medium for their propagationb

Question 9

Electromagnetic waves

Answer 9

Waves which do not require any medium for their propagation

Question 10

Longitudinal waves

Answer 10

Particals moves back and forth along the direction of propagation of wave

Question 11

Transverse waves

Answer 11

The vibratory motion of particals of the medium is perpendicular to the direction of propagation of wave

Question 12

Transverse waves

Answer 12

The vibratory motion of particals of the medium is perpendicular to the direction of propagation of wave

Question 13

Reflection

Answer 13

When waves moving in one medium fall on the surface of another medium they bounce back into the first medium such that the angle of incidence is equal to the angle of reflection

Question 14

Refraction

Answer 14

When a wave from one medium enters into the second medium at some angle it’s direction of travel changes

Question 15

Diffraction

Answer 15

The bending or spreading of waves around the sharp edges or corners of obstacles or slits

Question 16

Compressions

Answer 16

Wave consists of regions where loops of spring are closed together

Question 17

Rarefractions

Answer 17

Where loops of spring are spaced apart

Question 18

Seismic waves

Answer 18

Earthquake produces wave through the crust of the earth in form of seismic waves

Question 19

Ripple tanks

Answer 19

Device to produce water waves and to study their characteristics

Question 20

K constant

Answer 20

Spring constant defined as ratioa of external force to the displacement
K=-ma/x