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10 doubts found
All topicsCurrent ElectricityElectrostaticsGravitationKinematicsLaws of MotionMagnetism & Electromagnetic InductionModern PhysicsOscillations & WavesRotational MotionThermodynamics & Kinetic TheoryUnits, Dimensions & MeasurementWork, Energy & Power
NEETPhysicseasy
What does “Photoelectric effect” actually mean in Modern Physics, and why does it matter for NEET?
light ejects electrons from a metal only if its frequency exceeds a threshold, regardless of intensity.
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NEETPhysicsmedium
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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NEETPhysicseasy
What does “Photon energy” actually mean in Modern Physics, and why does it matter for NEET?
light comes in packets of energy E = hf = hc/λ.
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NEETPhysicsmedium
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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NEETPhysicseasy
What does “Bohr model” actually mean in Modern Physics, and why does it matter for NEET?
electrons occupy quantised orbits; for hydrogen E_n = −13.6/n² eV.
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NEETPhysicsmedium
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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NEETPhysicseasy
What does “Mass–energy and binding energy” actually mean in Modern Physics, and why does it matter for NEET?
a nucleus weighs less than its parts; the missing mass becomes binding energy via E = Δmc².
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NEETPhysicsmedium
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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NEETPhysicseasy
What does “de Broglie wavelength” actually mean in Modern Physics, and why does it matter for NEET?
every particle has a wavelength λ = h/p, significant only for tiny masses.
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NEETPhysicsmedium
I keep getting “de Broglie wavelength” questions wrong in Modern Physics. What's the trap?
expecting everyday objects to show wave behaviour (their λ is unimaginably small).
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