Physics Electron, Photon, Photoelectric Effect and X-rays Einstein Photoelectric Equation: Energy Quantum of Radiation MCQ (Single Correct)

The threshold wavelength for photoelectric emission in tungsten is 400 nm. The wavelength of light that must be used in order to eject electrons with a maximum energy of 0.9 eV is

A
120 nm
B
310 nm
C
380 nm
D
400 nm

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The correct answer is:
B

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