Advertisements
Advertisements
प्रश्न
Choose the correct answer from given options
Photons of frequency v are incident on the surface of two metals A and B of threshold frequency 3/4 v and 2/3 v, respectively. The ratio of maximum kinetic energy of electrons emitted from A to that from B is
पर्याय
2 : 3
4 : 3
3: 4
3: 2
Advertisements
उत्तर
According to Einstein's photoelectric equation,
hv = hv0 + Kmax
Where,
v = frequency of the incident light
v0 = threshold frequency of the metal
Kmax = maximum kinetic energy of the emitted photoelectrons
For the first metal,
`hv = h (3/4v)+ K_1`
⇒ `K_1 = (hv)/4`
For the second metal,
`hv = h(2/3v)+ K_2`
⇒ `K_2 = (hv)/3`
Thus, the ratio of the maximum kinetic energies is given as:
`K_1/K_2 = 3/4`
Hence, the correct answer is option 3 : 4.
APPEARS IN
संबंधित प्रश्न
Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.
Plot a graph showing the variation of photoelectric current with collector plate potential at a given frequency but for two different intensities I1 and I2, where I2 > I1.
Is p − E/c valid for electrons?
The frequency and intensity of a light source are doubled. Consider the following statements.
(A) The saturation photocurrent remains almost the same.
(B) The maximum kinetic energy of the photoelectrons is doubled.
A non-monochromatic light is used in an experiment on photoelectric effect. The stopping potential
A small metal plate (work function φ) is kept at a distance d from a singly-ionised, fixed ion. A monochromatic light beam is incident on the metal plate and photoelectrons are emitted. Find the maximum wavelength of the light beam, so that some of the photoelectrons may go round the ion along a circle.
How does one explain the emission of electrons from a photosensitive surface with the help of Einstein’s photoelectric equation?
The minimum energy required to remove an electron is called ______.
A student performs an experiment on photoelectric effect, using two materials A and B. A plot of Vstop vs ν is given in Figure.
- Which material A or B has a higher work function?
- Given the electric charge of an electron = 1.6 × 10–19 C, find the value of h obtained from the experiment for both A and B.
Comment on whether it is consistent with Einstein’s theory:
If c is the velocity of light in free space, the correct statements about photon among the following are:
- The energy of a photon is E = hv.
- The velocity of a photon is c.
- The momentum of a photon, ρ = `(h v)/c`
- In a photon-electron collision, both total energy and total momentum are conserved.
- Photon possesses positive charge.
Choose the correct answer from the options given below:
