23430.When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is
0.65 eV
1.0 eV
1.3 eV
1.5 eV
23431.The maximum kinetic energy of the photoelectrons depends only on
potential
frequency
incident angle
pressure
23432.After absorbing a slowly moving neutron of mass mN (momentum ~ 0) a nucleus of mass M breaks into two nuclei of masses m1 and 5m1 (6m1 = M + mN), respectively. If the de Broglie wavelength of the nucleus with mass m1 is λ, the de Broglie wavelength of the other nucleus will be
λ
25 λ
5 λ
λ/5
23433.Light of wavelength 500 nm is incident on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is
≤ 2.8 × 10–12 m
< 2.8 × 10–10 m
< 2.8 × 10–9 m
≥ 2.8 × 10–9 m
23434.Light of wavelength ‘λ’ which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity then stopping potential will
increase
decrease
be zero
become exactly half
23435.When monochromatic light of wavelength ‘λ’ is incident on a metallic surface, the stopping potential for photoelectric current is ‘3V0’. When same surface is illuminated with light of wavelength ‘2λ’, the stopping potential is ‘V0’. The threshold wavelength for this surface when photoelectric effect takes place is
λ
2λ
3λ
4λ
23436.If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor
2
1/2
√2
1/√2
23437.The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is
1.41 eV
1.51 eV
1.68 eV
3.09 eV
23438.A photon of energy 10.2 eV collides inelastically with a Hydrogen atom in ground state. After a certain time interval of few micro seconds another photon of energy 15.0 eV collides inelastically with the same hydrogen atom, then the observation made by a suitable detector is
1 photon with energy 10.2 eV and an electron with energy 1.4 eV
2 photon with energy 10.2 eV
2 photon with energy 1.4 eV
one photon with energy 3.4 eV and 1 electron with energy 1.4 eV
23439.The work function of metals is in the range of 2 eV to 5 eV. Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck constant = 4 × 10–15 eV, velocity of light = 3 × 108m/s)
510 nm
650 nm
400 nm
570 nm