A metal surface is irradiated with monochromatic light of varying frequencies
PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter
Problem
A metal surface is irradiated with monochromatic light of varying frequencies, and the corresponding stopping potential V0 is measured. The experimental points are found to lie on a straight line when V0 is plotted against the frequency ν.
(i) Write the mathematical form of the straight-line relation obtained from such an experiment, identifying all symbols used.
(ii) Explain what physical constant is represented by the slope of the line and what property of the metal is obtained from its intercept on the frequency axis.
(iii) Describe how the threshold frequency of the metal can be determined graphically from the line.