Download App

The Special Theory of Relativity — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThe Special Theory of Relativity3 Marks
Question
A uniformly moving train passes by a long platform. Consider the events' engine crossing the beginning of the platform' and 'engine crossing the end of the platform'. Which frame (train frame or the platform frame) is the proper frame for the pair of events?
✓

Answer

The platform frame is the rest frame so it can be regarded as the proper frame for the pair of events. The train can never approach a speed comparable to the speed of light. So, no issue of relativity comes into picture when moving train is considered as a frame for the pair of events. So, both train and platform can be taken as the proper frame for the pair of events.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from The Special Theory of Relativity→The Special Theory of Relativity — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Show that the vector addition is associative.

OR

Show that $(\vec{\text{A}}+\vec{\text{B}})+\vec{\text{C}}=\vec{\text{A}}+(\vec{\text{B}}+\vec{\text{C}}).$

→
A body oscillates with SHM according to the equation (in SI unit)

$\text{x}=5\cos\Big[2\pi\text{t}+\frac{\pi}{4}\Big]$

At t = 1.5 second, calculate (i) displecement, (ii) speed.

→
Two equal charges are placed at a separation of 1.0m. What should be the magnitude of the charges so that the force between them equals the weight of a 50kg person?
→
A rocket with a lift-off mass 20,000kg is blasted upwards with an initial acceleration of 5.0ms-2. Calculate the initial thrust (force) of the blast.
→
A rod is inserted as the core in the current-carrying solenoid of the previous problem.
  1. What is the magnetic intensity H at the centre?
  2. If the magnetization I of the core is found to be 0.12Nm, find the susceptibility of the material of the rod.
  3. Is the material paramagnetic, diamagnetic or ferromagnetic?
→
Considering a nearly circular orbit, prove that the square of time period of a planet is proportional to the cube of its radius.
→
Two soap bubbles of different diameters are in contact with a certain portion common to both the bubbles. What will be the shape of the common boundary as seen from inside the smaller bubble? Support your answer with a neat diagram. Give reason for your answer.
→
A cyclist moving with a velocity of 7.5m s-1 approaches a U-turn of radius 80m. He applies brakes to slow down his speed at a rate of 0.5m s-2. Calculate the acceleration of the cyclist on the turn.
→
Two tuning forks A and B when sounded together give 4 beats/ sec, A in unison with the note emitted by a length 0.96m of a sonometer wire under a certain tension while B is in unison with 0.97m of the same wire under the same tension. Find the frequencies of the forks.
→
Plot the corresponding reference circle for each of the following simple harmonic motions. Indicate the initial (t = 0) position of the particle, the radius of the circle, and the angular speed of the rotating particle. For simplicity, the sense of rotation may be fixed to be anticlockwise in every case: (x is in cm and t is in s).

$\text{x}=-2\sin\Big(3\text{t}+\frac{\pi}{3}\Big)$

→