Advertisements
Advertisements
рдкреНрд░рд╢реНрди
Which of the following graphs correctly represents the variation of maximum kinetic energy (Ek) of photoelectrons with the frequency (ЁЭЬИ) of the incident radiation?
рд╡рд┐рдХрд▓реНрдк
рдЙрддреНрддрд░
APPEARS IN
рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНрди
The energy of photon of wavelength X is_____ .
[h = Planck’s constant, c = speed of light in vacuum]
State two important properties of photon which are used to write Einstein’s photoelectric equation.
Define (i) stopping potential and (ii) threshold frequency, using Einstein’s equation and drawing necessary plot between relevant quantities.
According to Einstein’s model minimum energy needed for the electron to escape from a metal surface having work function ╧Х0, the electron is emitted with maximum kinetic energy, Kmax = ______.
Radiations of two photon's energy, twice and ten times the work function of metal are incident on the metal surface successively. The ratio of maximum velocities of photoelectrons emitted in two cases is:
A 200 W sodium street lamp emits yellow light of wavelength 0.6 µm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is:
The emission of electron is possible
Ultraviolet light is incident on metals P, Q and R, having work functions 8 eV, 2 eV and 4 eV respectively,
- Which metal has lowest threshold frequency for photoelectric effect?
- For which metal is the value of Emax minimum?
(Note: Emax is maximum kinetic energy of the emitted photoelectrons.)
How does stopping potential in photoelectric emission vary if the intensity of the incident radiation increases?
How does stopping potential in photoelectric emission vary if the frequency of incident radiation decreases?
