Tag: travelling waves

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

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.

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

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

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

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

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

$1.$ 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.

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 $4.52s$