14 Official GATE PH Questions with Verified Solutions & Answer Keys
A relativistic particle travels a length of $3 \times 10^{-3}$ m in air before decaying. The proper lifetime of the particle is $10^{-11}$ s. The speed of the particle is approxima...
The disintegration energy is defined to be the difference in the rest energy between the initial and final states. Consider the following process : 240 Pu →336 U +* He. The emitted...
For the set of all Lorentz transformations with velocities along the x-axis, consider the two stutements given below: P: If L is a Lorentz transformation then. L'is also a Lorentz ...
Two particles, each of rest mass m collide head-on and stick together. Before collision, the speed of each mass was 0.6 times the speed of light in free space. The mass of the fina...
A rod of proper length l0 oriented parallel to the x-axis moves with speed 2c/3 along the x-axis in the S-frame, where c is the speed of the light in free space. The observer is al...
The kinetic energy of a particle of rest mass 0m is equal to its rest mass energy. Its momentum in units of c m0 , where c is the speed of light in vacuum, is _______. (Give your a...
The kinetic energy of a particle of rest mass m, is equal to its rest mass energy. Its momentum in units of m,c, where c is the speed of light in vacuum, is _ (Give your answer upt...
Consider two concentric conducting spherical shells as shown in the figure. The inner shell has a radius a and carries a charge +Q. The outer shell has a radius b and carries a cha...
Two identical particles of rest mass m_0 approach each other with equal and opposite velocity v = 0.5c, where c is the speed of light. The total energy of one particle as measured ...
A rod PQ of proper length L lies along the x-axis and moves towards the positive x direction with speed v = 3c 5 with respect to the ground (see figure) , where c is the speed of l...
An inertial observer sees two spacecrafts S and T flying away from each other along x-axis with individual speed 0.5c, where c is the speed of light. The speed of T with respect to...
Which of the following option(s) is/are correct for photons?...
Which of the following consideration (s) is/are showing t hat nuclear beta decay , n → p + e- + 𝜈̅e, has to be a three-body decay?...
Nuclear radiation emitted from a Co60 radioactive source is detected by a photomultiplier tube (PMT) coupled to a scintillator crystal. Which of the following option(s) is/are corr...