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Statement(A) : Elasticity property is ne...

Statement(A) : Elasticity property is necessary for the propagation of sound
Statement(B) : In a stationary wave, the rate of transfer of energy across any section is zero

A

A is true, B is false

B

A is false, B is true

C

Both A and B are true

D

Both A and B are false

Text Solution

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The correct Answer is:
C
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Statement-1 : In the case of a stationary wave, a person hear a loud sound at the nodes as compared to the antinodes Statement-2 : In a stationary wave all the particles of the medium vibrate in phase.

Statement-1 : in standing wave average rate of transfer of energy at any cross-section is zero. because Statement-2 : instantaneous rate of energy transfer at node is equal to zero.

(a) What are the characteristics of stationary wave? (b) Derive an expression for the stationary wave using the expression prove that there is no transfer of energy in a stationary wave.

Water flows through a horizontal tube as shown in figure. If the difference of heights of water colun in the vertical tubes is 2 cm and the area of cross section at A and B are 4cm^2 and 2cm^2 respectively, find the rate of flow of water across any section.

Water flows through a horizontal tube as shown in figure. If the difference of height of water column in the vertical tubes in 2cm and the areas of corss-section at A and B are 4 cm^(2) and 2 cm^(2) respectively. Find the rate of flow of water across any section. .

Statement-1 : Standing wave of small amplitude is generated on a string. The kinetic energy of any small section of string will be same as its potential energy. Statement-2 : A standing wave can be written as superposition of two travelling waes. For a wave of small amplitude travelling on string, kinetic energy of any string element is equal to its potential energy at any instant.

Consider the following two statements: A. Linear momentum of a system of particles is zero. B. Kinetic energy of a system of particles is zero.

Statement-1 : It is not necessary for a particle to move in a circular path to define angular momentum. It can be defined about any point in space. Statement-2 : Particle moving in a straight line has non-zero angular momentum about a point which is not lying on the path of the particle.

Statement I: no electric current will be present within a region having uniform and constant magetic field. Statement II: Within a region of unifrom and cinstant magnetic field vec(B) , the path integral of magnetic field oint vec(B).dvec(l) along any closed path is zero. Hence, from Ampere cirauital law oint vec(B).dvec(l) = mu_(0)I (where the given terms ahve usual meaning), no current can be present within a region having uniform and constant magnetic field .

Statement(A): The reflection of sound from an extended object is echo Statement(B): The super position of waves of same frequency is beats Statement(C): The apparent change in frequency of source of sound due to relative motion between source and observer is Doppler effect Statement(D): The super position of wave of slightly differ in frequency is stationary waves

AAKASH SERIES-WAVES-EXERCISE-IA (Statement type questions:)
  1. Statement(A) : Elasticity property is necessary for the propagation of...

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  2. The intensity of a wave is (a) Proportional to square of the frequen...

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  3. Which of the following functions represent stationary wave. Where a,b,...

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  4. A steel wire of length 1 m and density 8000 kg//m^(3) is stretched ti...

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  5. During the apparent change in frequency due to relative motion of sour...

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  6. The apparent frequency and real frequency of sound are the same (A) ...

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  7. Statement(A): The reflection of sound from an extended object is echo ...

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  8. (A) Source motion effects the wavelength but observer motion effects t...

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  9. (A) The rotation of Saturn's rings and of double stars has been detect...

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  10. Velocity of sound in air (I) increases with temperature (II) decre...

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  11. If is desired to increase the fundamental resonance frequency in a tub...

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  12. (A): In solids mechanical waves can be either transverse or longitudin...

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  13. (A): Mechanical transverse waves can propagate only in medium with she...

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  14. (A): In a harmonic progressive wave of a given frequency all particles...

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  15. (A) : Relative to an observer at rest in a medium the speed of a mecha...

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  16. (A): According to Laplace the propagation of sound in air is an adiaba...

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  17. (A): A person hears maximum sound at displacement anti node (or) press...

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  18. A listener is at rest with respect to the source of sound. A wind star...

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