Physics-
General
Easy
Question
In an experiment on photoelectric effect the frequency f of the incident light is plotted against the stopping potential 
. The work function of the photoelectric surface is given by (e is electronic charge)
- OB
e in eV
- OB in volt
- OA in eV
- The slope of the line AB
e in eV
The correct answer is: OB e in eV
Using Einstein’s equation, 
Comparing this equation with 
We get intercept on – V0 axis 
Þ 
Þ 
Related Questions to study
Physics-
The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency n of incident light along X-axis. A straight line is obtained as shown. Planck's constant is given by
The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency n of incident light along X-axis. A straight line is obtained as shown. Planck's constant is given by
Physics-General
Physics-
For the photoelectric effect, the maximum kinetic energy 
of the emitted photoelectrons is plotted against the frequency n of the incident photons as shown in the figure. The slope of the curve gives
For the photoelectric effect, the maximum kinetic energy of the emitted photoelectrons is plotted against the frequency n of the incident photons as shown in the figure. The slope of the curve gives
Physics-General
Physics-
The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let 
and 
be the intensities and 
and 
be the frequencies for the curves a, b and c respectively
The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let and be the intensities and and be the frequencies for the curves a, b and c respectively
Physics-General
Physics-
In the following arrangement y = 1.0 mm, d= 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
In the following arrangement y = 1.0 mm, d= 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
Physics-General
Physics-
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
Physics-General
Physics-
A proton, a deutron and an a-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is
A proton, a deutron and an a-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is
Physics-General
Physics-
A photon of 
Joules is absorbed by a material under special circumstances. The correct statement is
A photon of Joules is absorbed by a material under special circumstances. The correct statement is
Physics-General
Physics-
An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass M. The piston and the cylinder have equal cross sectional area A. When the piston is in equilibrium, the volume of the gas is V0 and its pressure is P0. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency
An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass M. The piston and the cylinder have equal cross sectional area A. When the piston is in equilibrium, the volume of the gas is V0 and its pressure is P0. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency
Physics-General
Physics-
If a spring has time period T, and is cut into n equal parts, then the time period of each part will be -
If a spring has time period T, and is cut into n equal parts, then the time period of each part will be -
Physics-General
Physics-
In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be
In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be
Physics-General
Physics-
The wavelength of X-rays decreases, when
The wavelength of X-rays decreases, when
Physics-General
Physics-
A particle moves in the x-y plane according to the equation,
. The motion of the particle is-
A particle moves in the x-y plane according to the equation,. The motion of the particle is-
Physics-General
Physics-
Some springs are combined in series and parallel arrangement as shown in the figure and a mass m is suspended from them. The ratio of their frequencies will be
Some springs are combined in series and parallel arrangement as shown in the figure and a mass m is suspended from them. The ratio of their frequencies will be
Physics-General
Physics-
A 100 g block is connected to a horizontal massless spring of force constant 25.6 N/m. The block is free to oscillate on a horizontal frictionless surface. The block is displaced 3 cm from the equilibrium position, and at t =0, it is released from rest at x=0. The position-time graph of motion of the block is shown in figure When the block is at position B on the graph, its
A 100 g block is connected to a horizontal massless spring of force constant 25.6 N/m. The block is free to oscillate on a horizontal frictionless surface. The block is displaced 3 cm from the equilibrium position, and at t =0, it is released from rest at x=0. The position-time graph of motion of the block is shown in figure When the block is at position B on the graph, its
Physics-General
Physics-
In an X-ray tube electrons bombarding the target produce X-rays of minimum wavelength 1 
. What must be the energy of bombarding electrons
In an X-ray tube electrons bombarding the target produce X-rays of minimum wavelength 1 . What must be the energy of bombarding electrons
Physics-General
