Choose the correct statement(s): A. In photoelectric effect, the minimum negative potential to the plate A for which photocurrent is zero is called saturation potential. B. Maximum kinetic energy of photoelectrons is directly proportional to intensity of incident radiation. C. \( K_{\text{max}} = eV_0 \). D. Photocurrent becomes zero at stopping potential. E. For different intensities of light, stopping potential is different. Choose the correct answer from the options given below:
C & D only
- Statement A is incorrect because the potential at which photocurrent stops is called stopping potential, not saturation potential.
- Statement B is incorrect since the maximum kinetic energy of emitted photoelectrons depends on the frequency of light, not its intensity.
- Statement C is correct as per Einstein's photoelectric equation: \( K_{\text{max}} = eV_0 \).
- Statement D is correct because at stopping potential, even the most energetic electrons are unable to reach the anode, making the photocurrent zero.
- Statement E is incorrect because stopping potential depends on frequency, not intensity.
Thus, the correct answer is option 1.
Important Questions from Dual Nature of Radiation and Matter
The work function for an Aluminium surface is 4.2 eV. Find the threshold wavelength for the photoelectric emission.
A potentiometer wire of length L and a resistance r are connected in series with a battery of emf E0 and a resistance r1. An unknown emf E is balanced at a length l of the potentiometer wire. The emf E will be:
The time taken by light to travel normally through a glass plate of thickness 1 mm would be:
(Take refractive index of glass = 1.5)
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:
