AIPMT PRELIMS 2005 Physics Work Function and Threshold Frequency MCQ Question
The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are:
none
A only
A and B only
all the three metals
Correct Answer
Detailed Explanation
The energy of the incident photon is given by . For Å, the energy is approximately 3.02 eV. Metals A and B have work functions less than this energy, so they will emit photoelectrons.
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