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JEE Main 2025 (24 Jan, Shift 2) · Quantum Numbers, X-rays & Other Questions

Quantum Numbers, X-rays & Other Questions question from JEE Main 2025 (24 Jan, Shift 2)

Q1JEE Main 2025 · 24 JAN · SHIFT 2Easy

Quantum Numbers, X-rays & Other Questions

The energy E and momentum p of a moving body of mass m are related by some equation. Given that c represents the speed of light, identify the correct equation

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Answer: (c)

Relativistic energy-momentum relation: $E^2 = p^2c^2 + m^2c^4$ (with $m$ the rest mass).
Check: for $p = 0$ , $E = mc^2$ ; each term has units of energy squared, which rules out the other options.
So the answer is (c).

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