JEE · Physics · Modern Physics doubts

8 doubts found

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What does “Photoelectric effect” actually mean in Modern Physics, and why does it matter for JEE?

light ejects electrons from a metal only if its frequency exceeds a threshold, regardless of intensity.

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I keep getting “Photoelectric effect” questions wrong in Modern Physics. What's the trap?

thinking very bright low-frequency light can eject electrons.

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What does “Photon energy” actually mean in Modern Physics, and why does it matter for JEE?

light comes in packets of energy E = hf = hc/λ.

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I keep getting “Photon energy” questions wrong in Modern Physics. What's the trap?

treating light purely as a wave when explaining the photoelectric effect.

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What does “Bohr model” actually mean in Modern Physics, and why does it matter for JEE?

electrons occupy quantised orbits; for hydrogen E_n = −13.6/n² eV.

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I keep getting “Bohr model” questions wrong in Modern Physics. What's the trap?

using a positive energy for a bound electron — bound states are negative.

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What does “Mass–energy and binding energy” actually mean in Modern Physics, and why does it matter for JEE?

a nucleus weighs less than its parts; the missing mass becomes binding energy via E = Δmc².

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I keep getting “Mass–energy and binding energy” questions wrong in Modern Physics. What's the trap?

ignoring the mass defect when computing nuclear energy.

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