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Syllabus

Derivation for doppler's effect?

at what temperature will the speed of sound be double its value at 273K

Solve this:A travelling wave in a string is represented by y = 3 sin $\left(\frac{\mathrm{\pi}}{2}t\frac{\mathrm{\pi}}{4}x\right)$. The phase difference between two particles separated by a distance 4cm is (take x and y in cm and t in seconds )

$\left(1\right)\frac{\mathrm{\pi}}{2}rad\left(2\right)\frac{\mathrm{\pi}}{4}rad\phantom{\rule{0ex}{0ex}}\left(3\right)\mathrm{\pi}rad\left(4\right)0$

please give the readings of sonometer experiment to find relation betweeen frequncy and length of the wire

taken by it to travel the full length of rope will be

Q9. Figure shows a snapshot for a travelling sine wave along a string. Four elemental portions a, b, c, and d are indicated on the string. The elemental portion which has maximum potential energy is/ are

(1) a (2) b

(3) c (4) b and d

y =5 / (4x +6t)^{2}, wherexandyare in metre andtis in second. The velocity of pulse isQ. A listener X hears a sound level of 50dB when he is at a distance 1 km from the instrument. Another listener y at a distance 10 km from the source X hears a sound level of

(A) 30 dB (B) 20 dB (C) 10 dB (D) 5 dB

can you give me the derivation of y=Asin(wt-kx)?

A string fixed at one end in vibrating in its

second overtone. The lengthh of the string is

10 cm and maximum amplitude of vibration

of particles of the string is 2mm. Then the

amplitude of the particle at 9cm from the

open end is:

1) $\sqrt{3}mm$ 2) $\sqrt{2}mm$

3) $\frac{\sqrt{3}}{2}mm$ 4) None of these

A) 40 B)20 C)10 D)5

The sound intensity level at a point 4 m from the point source is 10 dB,then the sound level at a distance 2 m from the same source will be

Q. A suspension bridge is to be built across valley where it is known that the wind can gust at 5 s intervals. It is estimated that the speed of transverse waves along the span of the bridge would be 400 m/s. The danger of resonant motions in the bridge at its fundamental frequency would be greater if the span had a length of

(1) 2000 m (2) 1000 m

(3) 400 m (4) 80 m

what is the essential condition for the formation of beats?

$\left(1\right)\frac{{\lambda}_{0}v}{c}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{{\lambda}_{0}c}{v}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{{\lambda}_{0}{v}^{2}}{{c}^{2}}\phantom{\rule{0ex}{0ex}}\left(4\right)Zero$

a sonometer wire has a length 114 cm between two fixeed ends.where should be two bridges placed so that 3 segments have fundamental frequencies in the ratio 1:3:4?

A transverse wave is described by the equation y=y

_{0 }sin2pie (ft-x/a). The maximum particle velocity is equal to 4 times the wave velocity, what is the value of 'a'.What are standing waves?

a tuning fork of unknown frequency gives 4 beats with a tuning fork of freqency 310 Hz. it gives the same no. of beats on filing. find the unknown frequency

Fundamental frequency of a sonometer wire increases by SHM.If its tension is increased by 21%.How will frequency be affected if its length is increased by 10%.Please give the method. (ans=45.45Hz).

what is doppler effect?

two tuning forks A and B produce 4 beats/sec.On loading B with wax, 6 beats/sec are heard.If quantity of wax is reduced, the number of beats per second again becomes 4.Find the frequency of B if the frequency of B if the frequency of A is 256 hz?

_{1}=4sin500(pi)t and Y_{2}= 2sin506(pi)t. No. of beats produced per minute isa) 360

b) 60

c) 180

d) 3

a list of different types of musical instruments and which part of the instrument vibrates to produce sound.

two wave frequencies20Hz & 30Hz travel out from a common point. how will they differ in phase at the end of 0.75 sec?

show that in a closed end organ pipe only odd harmonies can be produced.

Answer is? 4sin [?/6t + ?/6]

Plz explain how..

3, A rope of length L and mass M hangs freely from the ceiling. If the time taken by a transverse wave to travel from the bottom to the top of the rope is T, then time to cover first half length is

$\left(1\right)T\left(2\right)T\left(\frac{\sqrt{2}-1}{\sqrt{2}}\right)\left(3\right)\frac{T}{\sqrt{2}}\left(4\right)\frac{T}{2}$

derive newton's formula for velocity of sound in air.

which of blue and red light will be deviated more by a prism and why?

Why fruits fall down from a tree, when its branches are shaken ?

y_{1}= 2 sin 2π (10t– 0.4x) andy_{2}= 4 sin 2π (20t– 0.8x). The ratio ofI_{max}toI_{min}_{ }is(1) 36 : 4 (2) 25 : 9 (3) 1 : 4 (4) 4 : 1

th lengh of a wire between 2 ends of a sonometer is 105 cm. where the 2 bridges should be placed so that the funadmental frequencies of the segments are in the ratio 1 is to 3 is to 5

The fundamental frequency of the open organ pipe is 300 Hz.The frequency of the first overtone of the another closed organ pipe is the same as the frequency of the first overtone of open pipe.What are the length of the pipes ?? The speed of the sound is=330ms

^{-1}.1.l/4,l/2

2.l/4,3l/4

3.l/2,l/4

4.l/2,3l/4

Correct ans is 1. Plz ans.

_{1}= A_{0}sin ( $\omega t-kx)and$ y_{2}= A_{0}cos ($\omega t-kx+\frac{\pi}{6})$ the resultant amplitude of oscillations will be (1) $\sqrt{3}$ A_{0}(2) A_{0}/2 (3) A_{0}(4) 3 A_{0}/2Solve this :Q. Figure shows a snapshot for travelling sine wave along a string. Four elemental a, b, c and d are indicated on the string. The elemental portion which has maximum potential energy is/are :

(1) a (2) b

(3) c (4) b and d

what are matter waves ?

what is mach number???what is its significance?

@meritnation Expert

Q1)-The displacement of a wave is represented by

y=0.25x10^{-3}sin (500t-0.25x)where

y, tandxare in cm, sec and m respectively. Deduce (a) the amplitude (b) wavelength (c) angular frequency (d) time period (e) amplitude of particle velocity.Q.42 A source which is emitting sound of frequency f is initially at (– r, 0) and an observer is situated initially at (2r, 0). If observer and source both are moving with velocities $\overrightarrow{\mathrm{v}}$

_{observer}= – $\sqrt{2}\mathrm{V}\hat{\mathrm{i}}-\sqrt{2}\mathrm{V}\hat{\mathrm{j}}$ and $\overrightarrow{\mathrm{v}}$_{source}= $\frac{\mathrm{V}}{\sqrt{2}}\hat{\mathrm{i}}+\frac{\mathrm{V}}{\sqrt{2}}\hat{\mathrm{j}}$ , then which of the following is correct option ?(A) Apparent frequency first increases, then decreases and observer observes the original frequency once during the motion.

(B) Apparent frequency first increases, them decreases and observer observes the original frequency twice during the motion.

(C) Apparent frequency first increases, them decreases during the motion and obsercver never obseerves the initial frequency.

(D) Apparent frequency continuously decreases and once during the motion. observer hears the original frequency.

what are progressive wave? and what are its characteristics and derive tthe equation of progressive wave.

v. The source is distant d from the place of support of swing. If velocity of sound is c, acceleration due to gravity is g, then the maximum and minimum frequency heard by a listener in front of swing is(A) $\frac{\mathrm{cv}}{\sqrt{2\mathrm{gd}-\mathrm{c}}},\frac{\mathrm{cv}}{\sqrt{2\mathrm{gd}+\mathrm{c}}}$

(B) $\frac{\mathrm{cv}}{\sqrt{2\mathrm{gd}\left(1-\mathrm{cos\theta}\right)}-\mathrm{c}},\frac{\mathrm{cv}}{\sqrt{2\mathrm{gd}\left(1-\mathrm{cos\theta}\right)}+\mathrm{c}}$

(C) $\frac{\mathrm{cv}}{\mathrm{c}-\sqrt{2\mathrm{gd}\left(1-\mathrm{cos\theta}\right)}},\frac{\mathrm{cv}}{\mathrm{c}+\sqrt{2\mathrm{gd}\left(1-\mathrm{cos\theta}\right)}}$

(D) $\frac{\mathrm{cv}}{\mathrm{c}-\sqrt{2\mathrm{gd}\left(1-\mathrm{sin\theta}\right)}},\frac{\mathrm{cv}}{\mathrm{c}+\sqrt{2\mathrm{gd}\left(1-\mathrm{sin\theta}\right)}}$

Q. A standing sound wave in a pipe has five displacement nodes and five antinoges. What is the harmonic number of vibrations?

what are beats explain

OBJECTIVE QUESTION-PLEASE SOLVE THIS ANSWER SOON

the phase difference between prongs of tuning fork is

A)PIE B)PIE/3 C)2*PIE D) NON OF THESE

displacement relation for a progressive wave