NEET Physics Dual Nature Of Matter Radiation Class 12 Questions

In photoelectric effect, A. The photocurrent is proportional to the intensity of the incident radiation. B. Maximum Kinetic energy with which photoelectrons are emitted depends on the intensity of incident light. C. Max. K.E with which photoelectrons are emitted varies linearly with the frequency of incident light. D. The emission of photoelectrons require a minimum threshold intensity of incident radiation. E. Max. K.E of the photoelectrons is independent of the frequency of the incident light. F. For a frequency ν of incident radiation, lower than the cut-off frequency ν₀, no photoelectric emission is possible even if the intensity is large.

Match List I with List II. Choose the correct answer from the options given below.

A particle of mass m is moving around the origin with a constant force F pulling it towards the origin. If Bohr model is used to describe its motion, the radius r of the nth orbit and the particle’s speed v in the orbit depend on n as

Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis?

If c is the velocity of light in free space, the correct statements about photon among the following are : A. The energy of a photon is \( E = h\nu \). B. The velocity of a photon is \( c \). C. The momentum of a photon, \( p = \frac{h\nu}{c} \). D. In a photon-electron collision, both total energy and total momentum are conserved. E. Photon possesses positive charge. Choose the correct answer from the options given below :

The graph which shows the variation of \( \left( \frac{1}{\lambda^2} \right) \) and its kinetic energy, E is (where \( \lambda \) is de Broglie wavelength of a free particle):

The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons?

The minimum wavelength of X-rays produced by an electron accelerated through a potential difference of V volts is proportional to:

The graph which shows the variation of the de Broglie wavelength (λ) of a particle and its associated momentum (p) is:

When two monochromatic lights of frequency, ν and ν/2 are incident on a photoelectric metal, their stopping potential becomes Vₛ/2 and Vₛ respectively. The threshold frequency for this metal is:

An electromagnetic wave of wavelength 'λ' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength λₑ then :

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?

When the light of frequency 2ν₀ (where ν₀ is threshold frequency), is incident on a metal plate, then the maximum velocity of electrons emitted is v₁. When the frequency of the incident radiation is increased to 5ν₀, the maximum velocity of electrons emitted from the same plate is v₂. The ratio of v₁ to v₂ is

The photoelectric threshold wavelength of silver is 3250 x 10⁻¹⁰ m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 x 10⁻¹⁰ m is: (Given: h = 4.14 x 10⁻¹⁵ eVs and c = 3 x 10⁸ m/s)

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m, is:

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is (c being velocity of light)

When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is V/4. The threshold wavelength for metallic surface is

Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?

A certain metallic surface is illuminated with monochromatic light of wavelength λ₁. The stopping potential for photo-electric current for this light is 3V₀. If the same surface is illuminated with light of wavelength 2λ₁, the stopping potential is V₀. The threshold wavelength for this surface for photoelectric effect is

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

A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V₀. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be: