Relativity

In Newtonian Mechanics the physical quantities mass, length and time are considered as absolute quantities.

• True

• False

Transverse nature of Light can be verified using

• Diffraction

• Interference

• Polarization

• Reflection

Which Experiment contradicted the ether hypothesis

• Michelson-Morely Experiment

• Lorentz Experiment

• Youngs Experiment

• Galilean Transformation

Which among the following is a postulate of Einstein Special Theory of Relativity.

• The laws of physics vary in different inertial frames of reference.
• Only some laws of physics apply in inertial frames of reference.
• The laws of physics are different in non-inertial frames of reference.
• The laws of physics are the same in all inertial frames of reference.

Which among the following is a postulate for Einstein's Special Theory of Relativity.

• Time can be altered by changing the speed of an object.
• The speed of light in a vacuum is constant.
• Mass increases with speed in a vacuum.
• The speed of sound is constant in all mediums.

When v< < c, the Lorentz Transformation equation reduces to Galilean Transformation equation.

• True

• False

In the Michelson-Morely experiment a glass plate is kept in one of the paths of the light beam. why?

• To reflect the light beam back to the source.
• To increase the speed of light in that path.
• To absorb the light and prevent interference.
• To make the optical paths of the two beams equal.

A particle moving with zero rest mass is always moving with twice the speed of light.

• True

• False

A 200 m long train has to pass through 150 m long tunnel. If the train moves towards the tunnel with a speed of 0.8c. Find the length of the train and the tunnel as seen by a man

a) at the train

b) at the tunnel

Spontaneous emission of electron and positron when a high energy radiation passes near a nucleus is known as