Light of wavelength 400 nm is incident on the cathode of a photocell, the stopping potential recorded is 6.0 V. If the wavelength of the incident light is increased to 600 nm, what will be the new stopping potential?
Let W be the work function of the cathode surface, and v the frequency of light falling on the surface. Then, according to Einstein’s photoelectric equation, the maximum kinetic energy Ek of the emitted electrons is given by
where is the wavelength of the incident light.
If the cut-off potential is V0, then the maximum kinetic energy of the electron, . Thus
If the wavelength of the incident light is increased from , then the change (decrease) in the stopping potential will be
= 4.97 V.
The threshold wavelength of sodiam metal is 6800the work function is:
The work function of a sulsstance is 4.0ev the longest wavelength of light that can cause photoelectron emission from this sulsstance is opprinately.
Potential energy of li2t electron is
The slope of frequency of incident light and stopping potential for a given surface will be.
If is the radsies of the first orbit of hydrogen atom, then the radii of second, third and forth orbit in terms of us.
Which of the following. Species will produe the shorte wavelength for thetransition n = 2 to n = ?
The de- Broglie wavelength associated with proton changes by 0.25%. if its momentum is changed by the initial momentum was
The ratio of velocities of proton and - particle is 4:1, then he ratio of their de-brohlie wavelength is
Cut-off wavelength for continous x – rays coming from x – rays tulie operating at 40 kv:
When a surface is irradiated with light of wavelength 4950 Å, a photocurrent appears which vanishes if a potential greater than 0.6 V is applied across the photo-table. When a different source of light is used, it is found that the critical retarding potential is changed to 1.1 V. Find the work function of the emitting surface and the wavelength of the second source. If the photoelectrons (after emission from the surface) are subject to a magnetic field of 10 T, what changes will be observed in the above two retarding potentials?