all sound formulas and defined
9 th
Answers
Answer:
i) Echo
Speed of echo = ( 2 × distance between surface and source ) / time
(ii) V = f λ
where V = velocity of wave ,
f = frequency of sound wave ,
λ = wavelength .
(iii) f = 1 / t
where f = frequency of wave ,
t = time period .
(iv) E = h nu
where h = Plank's constant
E = energy of wave .
(v) f = √T/ 2 l ( π r² d )
f = frequency of stretched string
l = length
d = density
r = radius
T= time period .
Answer:
sound is a source of energy which produce sensation of hearing.
longitudinal wave :- the direction of propagation of sound energy is parallel to the direction of vibration of particles is called longitudinal wave.
the alternate formation of compression and rarefaction is also know as longitudinal wave .
transverse wave :- the direction of propagation of light energy is perpendicular to the direction of vibration of particle is called transverse wave.
time period :- the time taken by the particles to complete one oscillation is called time period
frequency :- the number of oscillation per unit is called frequency.
formula of frequency
frequency = number of oscillation
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time
SI unit of frequency is hertz
velocity = distance
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time
velocity = wavelength
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time
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