Tag: properties of waves

Questions Related to properties of waves

For propagation of a mechanical wave, the medium must possess

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. inertia

  2. conductivity

  3. plasticity

  4. elasticity

Show answer
Correct Option: A,D
Explanation:
  • MEDIUM SHOULD BE ISOTROPIC: The properties of the medium should be the same in all directions.
  • ELASTICITY : The medium should have elasticity so that the particles return back to their original positions after being displaced.
  • INERTIA : This allows the particles to store kinetic energy.
  • MINIMUM FRICTION : So that the particles oscillate and the wave travels for a sufficiently long time and distance.
  • these were the properties required for propagation of mechanical waves , so the answer is A and D.

Waves can undergo

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. reflection

  2. refraction

  3. diffraction

  4. All of the above 

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Correct Option: D
Explanation:

waves can go reflection , refraction and diffraction  like  light being an EM wave performs all these phenomenons.

so the answer is D.

Water waves are an example of waves that involve

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. longitudinal motions.

  2. transverse motions.

  3. a combination of both longitudinal and transverse motions

  4. some unknown type of motions,

Show answer
Correct Option: C
Explanation:

Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. The radius of the circles decreases as the depth into the water increases.

so the answer is C.

Which of the following waves do not require any kind of medium to propagate ?

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. Sound waves

  2. Earthquake

  3. Light Waves

  4. Water surface waves

Show answer
Correct Option: C
Explanation:

electromagnetic waves donot require medium for propagation . light is a EM wave.

so the answer is C.

State whether true or false :
With the change of medium, the frequency doesn't change, however both the velocity and wavelength change 

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. True

  2. False

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Correct Option: A
Explanation:

with change in medium the wavelength and velocity of wave both are changed but being property of source remains constant and doesnot change.

so the answer is A

With propagation of longitudinal waves through a medium, the quantity transmitted is : 

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. matter

  2. energy

  3. energy and matter

  4. energy, matter and momentum

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Correct Option: B
Explanation:

longitudinal waves are propagated by  propagation of energy by particles of the medium.

so the answer is B.

When a wave is reflected from a ___________ medium, there is a phase change of $\pi$.

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. rarer

  2. denser

  3. both

  4. none of the above

Show answer
Correct Option: B
Explanation:

when reflection of wave takes place from the denser medium then  it undergoes a phase change of $\pi$ . 

answer is B.

State true or false :
Mechanical Waves are waves which propagate through a material medium.

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

mechanical waves  are waves which needs medium for propogation.. energy is transferred  while propagation from particle to particle of medium.

so the answer is A

Which of the following statements are true for wave motion ?

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. Mechanical transverse waves can propagate through all mediums

  2. Longitudinal waves can propagate through solids only

  3. Mechanical transverse waves can propagate through solids only

  4. Longitudinal waves can propagate through vacuum

Show answer
Correct Option: C
Explanation:

$1.$ Mechanical transverse waves cannot propagate through all the medium. They can only propagate through solids not in gas or a liquid because there is no mechanism for driving motion perpendicular to the propagation of the wave.

$2.$ Longitudinal wave can propagate through all type of medium.
$3.$ Mechanical transverse wave can propagate through solids only.
$4.$ Longitudinal wave cannot propagate through vaccum.
Hence, option $C$ is correct.

A man sets his watch by the noon whistle of a factory at a distance of $1.5 km.$ Then the number of seconds his watch slower than the clock of the factory (velocity of sound $= 332 m/s$) is 

physics properties of waves longitudinal and transverse waves travelling waves types of waves

  1. $4.52 sec$

  2. $5.35 sec$

  3. $2.18 sec$

  4. $3.76 sec$

Show answer
Correct Option: A
Explanation:

time taken for the whistle to reach the person is $\dfrac{d}{v}$
$=\dfrac{1.5\times 1000}{332}=4.52sec$
$\therefore$ delay of his clock is $4.52s$