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Physics Waves

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2 months ago

Physics Waves Class 11th

A stationary observer receives sound from two identical tuning forks, one of which approaches and the other one recedes with the same speed (much les than the speed of sound). The observers hears 2 beats/sec. The oscillation frequency of each tuning fork is $v_{0} = 1400 H z$ and the velocity of sound in air is $350 m / s$ . The speed of each tuning fork is close to:

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alok kumar singh

Contributor-Level 10

$f_{1} = f_{o} (\frac{v}{v - v_{s}}) f_{1} - f_{2} = 2$

$f_{2} = f_{o} (\frac{v}{v + v_{s}}) f_{0} v [\frac{v + v_{s} - (v - v_{s})}{v^{2} - v_{s}^{2}}] = 2; \frac{2 f_{0} v v_{s}}{v^{2} - v_{s}^{2}} = 2$

$? v_{s} ? v ∴ v_{s} = \frac{1}{4} m / s$

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2 months ago

Physics Waves Class 11th

A stationary observer receives sound from two identical tuning forks, one of which approaches and the other one recedes with the same speed (much les than the speed of sound). The observers hears 2 beats/sec. The oscillation frequency of each tuning fork is $v_{0} = 1400 H z$ and the velocity of sound in air is $350 m / s$ . The speed of each tuning fork is close to:

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New answer posted

2 months ago

Physics Waves Waves

A closed-organ pipe of length L and an open pipe contain gases of densities ρ? and ρ? respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open pipe is (3/x) L √(ρ?/ρ?) where x is ---. (Round off to the Nearest Integer)

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alok kumar singh

Contributor-Level 10

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2 months ago

Physics Waves Class 11th

The mass per unit length of a uniform wire is 0.135 g/cm. A transverse wave of the form y = -0.21 sin(x + 30t) is produced in it, where x is in meter and t is in second. Then, the expected value of tension in the wire is x * 10^-2 N. Value of x is-----------. (Round-off to the nearest integer)

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Payal Gupta

Contributor-Level 10

$v = \frac{ω}{k} = \frac{30}{1} = 30 m / s$

$v = \sqrt[]{\frac{T}{μ}} \Rightarrow T = μ v^{2} = \frac{0.135 * 1 0^{- 3}}{1 0^{- 2}} * {(30)}^{2} = 12.15 N = 1215 * 1 0^{- 2} N$

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2 months ago

Physics Waves Class 11th

The percentage increase in the speed of transverse waves produced in a stretched string if the tension is increased by 4%, will be………….%.

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Payal Gupta

Contributor-Level 10

$v = \sqrt[]{\frac{T}{μ}}$

new v' = $\sqrt[]{\frac{1.04 T}{μ}}$

% change = $(\sqrt[]{1.04} - 1) * 100$

= 2%

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2 months ago

Physics Waves Waves

The frequency of a car horn encountered a change from 400Hz to 500Hz, when the car approaches a vertical wall. If the speed of sound is 330 m/s. Then the speed of car is_________km/h.

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alok kumar singh

Contributor-Level 10

Initially wall will act as observer, so with the help of Doppler's effect, we can write

$f' = \frac{c}{c - v_{0}} f_{0}$

Now wall will act as source of sound of frequency f', so With the help of Doppler's effect, we can write

$f'' = \frac{c + v_{0}}{c} f^{'} = \frac{c + v_{0}}{c - v_{0}} f_{0}$

$\Rightarrow 500 = (\frac{c + v_{0}}{c - v_{0}}) 400 \Rightarrow 5 c - 5 v_{0} = 4 c + 4 v_{0} \Rightarrow v_{0} = \frac{c}{9} = \frac{330}{9} m / s = \frac{330}{9} * \frac{18}{5} k m / h = 132 k m / h$

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2 months ago

Physics Waves Waves Institute

The amplitude of wave disturbance propagating in the positive x-direction is given by $y = \frac{1}{1 + {(x)}^{2}}$ at time t = 0 and $y = \frac{1}{1 + {(x - 2)}^{2}}$ at t = 1s, where x and y are in metres. The shape of wave does not change during the propagation. The velocity of the wave will be_______ m/s.

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alok kumar singh

Contributor-Level 10

The equation of wave at any time t will be $y = \frac{1}{1 + {(x ? v t)}^{2}},$ so v * 1 = 2 -> v = 2m/s

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2 months ago

Physics Waves

Which exams would be most similar to Physics Waves?

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2 months ago

Physics Waves Class 11th

What is the difference between longitudinal and transverse displacement?

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Syed Aquib Ur Rahman

Contributor-Level 10

The main difference lies in the direction. We should know that in a longitudinal wave, the displacement of particles is parallel to the direction of wave propagation. In a transverse wave, however, the displacement is perpendicular to the direction of wave propagation.

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2 months ago

Physics Waves Class 11th

What are the units of angular wave number and angular frequency?

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Syed Aquib Ur Rahman

Contributor-Level 10

The units of angular wave number and angular frequency are slightly different.

Angular wave number k has units of radian per metre (rad/m).
Angular frequency has units of radian per second (rad/s).

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