Every question from past board papers on Photoelectric effect, Hertz and Lenard's observations, newest paper first. Open any question for its full worked answer.
Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis?
A. Photoelectric current vs Intensity of light: straight line through origin rising
B. Photoelectric current vs Intensity of light: horizontal constant line
C. Photoelectric current vs Frequency of light: straight line through origin rising
D. Photoelectric current vs Frequency of light: line starting from a positive intercept on the x-axis (threshold) and rising
The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons?
Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?
