chp1

Question 1

waves

Answer 1

a method of transport of energy from one point toa nother point without transfer of matter

Question 2

transverse wave

Answer 2

it is a wave where the wave particles is pependicular to the wave mtion

Question 3

amplitude

Answer 3

it is the maximum displacement moved by a point on a wave

Question 4

crest

Answer 4

it is the point on a surface wave where the displacement of wave is at maximum

Question 5

trough

Answer 5

it is the point on a surface wave where the displacement of wave is at minimum

Question 6

longitudinal wave

Answer 6

it is a wave where the direction of wave is parallel to the wave motion

Question 7

compression

Answer 7

it is a point on longitidinal wave where the turns of coil or particles are at closer

Question 8

rarefaction

Answer 8

it is a point on longitidinal wave where the turns of coil or particles are further apart

Question 9

reflection of wave

Answer 9

bouncing back of wave into the same medium by striking into other medium surface is called reflection

Question 10

refraction of waves

Answer 10

when a wave enters from region of deep water to shallow water at an angle it changes its direction

Question 11

diffraction of waves

Answer 11

the spreading of waves near an obstacle is called diffraction

Question 12

time period

Answer 12

it is time taken for any point on a wave to complete one oscilation

Question 13

what is the SI unit of timeperiod?

Answer 13

S second

Question 14

frequency

Answer 14

it is defined as the the complete waves produced by source per uni of time ..it also defined as reciprocal of period

Question 15

formula and si unit of frequency

Answer 15

FORMULA
no. of comlplete oscillations / time period
SI UNIT
Hz

Question 16

wavlength λ

Answer 16

it is the distance b/w two successive crusts and trough in a transverse wave and two successive compressons and rarefactions in a longitidinal wave

Question 17

si unit of wave lenght

Answer 17

m

Question 18

wavespeed with si uniy with derivation

Answer 18

it is the distance travelled by a given point on wave
si unit is m/s
as we know speed= distance / time
V=s/t S= λ
t = 1/f
V= 1/ f x λ
V= λf
as we know v=s/t
vt=s
s= λ
λ = vt

Question 19

wavefront

Answer 19

it is an imaginary line on a wave that joins all point in a same phase

Question 20

vibratory motion

Answer 20

when a moving body moves to and fo abou=ut a mean position then it is called vibratory motion

Question 21

periodic motion

Answer 21

the mtion of a wave that repeats itself in equal interval of time is called periodic motion .

Question 22

displacement

Answer 22

the minmum ditance covered by a body is called displacement

Question 23

simple harmonic motion

Answer 23

it occurs when the net force is dircely proptionla to the displacement of mean positoin