Conceptual Questions | Chapter 13 | Relativity | Physics 11th | National Book Foundation 2025

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What is the difference between inertial and non-inertial frames of reference?
What are the postulates of special relativity?
Explain why it is impossible for a particle with mass to move faster than the speed of light.
Imagine a train travelling at the speed of light. A person on this train looks into the mirror placed in front of him. Will this person see a reflection of themselves in the mirror?
What happens to the density of an object as its speed increases?
What is meant by relativity of simultaneity?
What is meant by frames of reference? Explain with the help of examples. Also discuss its types.
Discuss the postulates of the special theory of relativity.
Explain the following consequences of the special theory of relativity:
(a) Relativity of simultaneity (b) Length Contraction (c) Time Dilation (d) Mass Variation (e) Mass-Energy Equivalence
State and explain that time is a fourth dimension of the traditional three dimensions of space.
Calculate the equivalent energy of an electron having rest mass 9.11×〖10〗^(-31) kg.
The length of a spaceship is 100m long. What will be its length if the spaceship moves with a speed of 0.99c.
Particle called π-mesons are produced by accelerator beams. If these particles travel at 2.70×〖10〗^8 m/s and live 2.60×〖10〗^(-8) s when at rest relative to an observer. How long do they live as viewed in the laboratory?
A neutral π-meson lives 1.40×〖10〗^(-16) s as measured in the laboratory, an 0.840×〖10〗^(-16) s when at rest relative to an observer, what is its velocity relative to the laboratory?

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