The figure shows the variation of photo current with anode potential for a photo-sensitive surface for three different radiations. Let \( I_a \), \( I_b \), and \( I_c \) be the intensities, and \( y_a \), \( y_b \), and \( y_c \) be the frequencies for the curves a, b, and c, respectively. Choose the correct statement.
y_a = y_b; I_b = I_c
Photoelectric current is proportional to intensity, while the stopping potential depends on frequency. Since curves a and b have the same stopping potential, their frequencies are equal (\( y_a = y_b \)). Additionally, the saturation current for curves b and c is the same, meaning \( I_b = I_c \).
Important Questions from Dual Nature of Radiation and Matter
A point source causing photoelectric emission from a metallic plate is moved away from the plate. The variation of photoelectric current with distance from the source is correctly represented by the graph:
The wavelength of light from the spectral emission line of sodium is 662 nm. The kinetic energy at which an electron would have the same de Broglie wavelength would be: (h=6.62×10−34J⋅s,me=9×10−31kg)
Energy of a photon corresponding to a wavelength of 600 nm is 2.08 eV. The energy of a photon of wavelength 400 nm will be:
A particle moves three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is 1.813 × 10-4. The mass of the particle is:
According to Einstein’s photoelectric equation, the plot of the Kinetic Energy of the emitted photoelectrons from a metal versus the frequency of the incident radiation gives a straight line whose slope:
