HARD

Earn 100

Write the equation of reflected wave which is reflected from a fixed end if the equation of incident wave is $y (x, t) = a \sin (k x - ω t)$ .

Important Questions on Waves

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

The amplitude and frequency of two waves is same which are from two different sources, overlap at a point. The ratio of intensity when two waves arrive

(\frac{π}{2})

out of phase to when they arrive in phase is

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two identical progressive waves moving in opposite direction superimpose to produce a stationary wave. The wavelength of each progressive wave is

λ

. The wavelength of the stationary wave is

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

Sound waves from a loudspeaker reach a point

P

via two paths which differ in length by

1.8 m

. When the frequency of sound is gradually increased, the resultant intensity at

P

is found to be maximum the frequency is

1000 Hz

. At what next higher frequency will a maximum be detected?
(velocity of sound

= 360 m / s)

MEDIUM

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two simple harmonic motions are represented by the equations

x_{1} = 5 \sin (2 π t + \frac{π}{4})

and

x_{2} = 5 \sqrt{2} (\sin 2 π t + \cos 2 π t) .

The amplitude of the second motion is _____ times the amplitude in the first motion.

HARD

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two loudspeakers

M

and

N

are located

20 m

apart and emit sound at frequencies

118 Hz

and

121 Hz

, respectively. A car is initially at a point

P

1800 m

away from the midpoint

Q

of the line

M N

and moves towards

Q

constantly at

60 km h^{- 1}

along the perpendicular bisector of

M N

. It crosses

Q

and eventually reaches a point

R

1800 m

away from

Q

. Let

ν (t)

represent the beat frequency measured by a person sitting in the car at time

t

. Let

ν_{p}, ν_{Q} and ν_{R}

be the beat frequencies measured at locations

P, Q

and

R

, respectively. The speed of sound in air is

330 m s^{- 1} .

Which of the following statement(s) is (are) true regarding the sound heard by the person?

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two waves of the same kind and of the same amplitude

A

superpose at a point with a phase difference of

φ

between them. Find the resultant amplitude (R).

HARD

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two identical coherent sound sources $R$ and $S$ with frequency $f$ are $5 m$ apart. An observer standing equidistant from the source and at a perpendicular distance of $12 m$ from the line $R S$ hears maximum sound intensity.

When he moves parallel to $R S$ , the sound intensity varies and is a minimum when he comes directly in front of one of the two sources. Then, a possible value of $f$ is close to (the speed of sound is $330 m / s$ )

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

The equations of two waves are given by :

$y_{1} = 5 \sin 2 π (x - v t) cm$

$y_{2} = 3 \sin 2 π (x - v t + 1.5) cm$

These waves are simultaneously passing through a string. The amplitude of the resulting wave is :

MEDIUM

Physics>Oscillations and Waves>Waves>Reflection of Waves

If two waves of the same frequency and amplitude respectively on superposition produce a resultant disturbance of the same amplitude, the waves differ in phase by

MEDIUM

Physics>Oscillations and Waves>Waves>Reflection of Waves

Three harmonic waves having equal frequency

v

and same intensity

I_{0}

, have phase angles

0, \frac{π}{4}

and

- \frac{π}{4}

respectively. When they are superimposed the intensity of the resultant wave is close to:

MEDIUM

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two waves are simultaneously passing through a string and their equations are :

y_{1} = A_{1} \sin k (x - v t), y_{2} = A_{2} \sin k (x - v t + x_{0}) .

Given amplitudes

A_{1} = 12 mm

and

A_{2} = 5 mm

x_{0} = 3.5 cm

and wave number

k = 6.28 {cm}^{- 1} .

The amplitude of resulting wave will be _____

mm .

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

A wave is reflected from a rigid support. The change in the phase of the reflected wave will be

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two light beams of intensities in the ratio of

9 : 4

are allowed to interfere. The ratio of the intensity of maxima and minima will be :

MEDIUM

Physics>Oscillations and Waves>Waves>Reflection of Waves

Three sinusoidal waves with the same angular frequency but with different amplitudes

A, \frac{A}{2}, \frac{A}{3}

and phase angles

0, \frac{π}{2}

and

π

respectively move along the same direction and superpose with each other. The amplitude of the resultant wave is given by

HARD

Physics>Oscillations and Waves>Waves>Reflection of Waves

The interference pattern is obtained with two coherent light sources of intensity ratio

4 : 1

. And the ratio

\frac{I_{\max} + I_{\min}}{I_{\max} - I_{\min}}

\frac{5}{x}

. Then, the value of

x

will be equal to :

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two waves executing simple harmonic motion travelling in the same direction with same amplitude and frequency are superimposed. The resultant amplitude is equal to the

\sqrt{3}

times of amplitude of individual motions. The phase difference between the two motions is _____ (degree)

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

Two harmonic travelling waves are described by the equations

y_{1} = a \sin (k x - ω t)

and

y_{2} = a \sin (- k x + ω t + ϕ)

The amplitude of the superposed wave is

EASY

Physics>Oscillations and Waves>Waves>Reflection of Waves

A steel wire with mass per unit length

7.0 \times 10^{- 3} kg m^{- 1}

is under tension of

70 N

. The speed of transverse waves in the wire will be:

MEDIUM

Physics>Oscillations and Waves>Waves>Reflection of Waves

Explain the reflection of transverse and longitudinal waves from a denser medium and rarer medium.

HARD

Physics>Oscillations and Waves>Waves>Reflection of Waves

A gun is fired on a sea shore in front of a line of cliffs. A man standing

90 m

from the gun(line connecting man & the gun is parallel to the cliffs) notices that echo takes twice as long to reach him as does the direct report. Find the distance between gun and the cliff to the nearest integer(in meters).

Write the equation of reflected wave which is reflected from a fixed end if the equation of incident wave is y(x,t) = asin(kx-ωt).

Important Questions on Waves

Learn and Prepare for any exam you want !

Write the equation of reflected wave which is reflected from a fixed end if the equation of incident wave is $y (x, t) = a \sin (k x - ω t)$ .