NEET Questions Solved


In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be

(a) 2 V                     (b) Less than 2 V
(c) Zero                   (d) Greater than 2 V

(d) According to Einstein's photoelectric equation

E=W0+KmaxV0=hce1λ-1λ0

Hence if λ decreases V0 increases.

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