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← ScienceWhich mechanism initiates electron emission in a photomultiplier tube when a photon strikes?
A)Photoelectric effect releasing free electrons✓
B)Thermionic emission from dynode heating
C)Field emission via strong electric fields
D)Secondary emission colliding existing electrons
💡 Explanation
The photoelectric effect initiates electron emission; photon energy overcomes the work function releasing electrons because absorbed light imparts energy, therefore generating initial electrons, rather than temperature or accelerating forces.
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