HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions

A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and `λ/2`. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the material is

In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be

Two radiations with photon energies 0.9 eV and 3.3 eV respectively are falling on a metallic surface successively. If the work function of the metal is 0.6 eV, then the ratio of maximum speeds of emitted electrons in the two cases will be

A light source of wavelength 520 nm emits 1.04 × 10¹⁵ photons per second while the second source of 460 nm produces 1.38 × 10¹⁵ photons per second. Then the ratio of power of second source to that of first source is

If the mean wavelength of light from sun is taken as 550 nm and its mean power as 3.8 × 10²⁶ W, then the average number of photons received by the human eye per second from sunlight is of the order of

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is __________.

A light of wavelength 500 nm is incident on a sensitive metal plate of photoelectric work function 1.235 eV. The kinetic energy of the photoelectrons emitted is (Take h = 6.6 × 10^–34 Js)

Photons of wavelength λ are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is

The work functions for metals A, B and C are 1.92 eV, 2.0 eV and 5.0 eV respectively. The metal/metals which will emit photoelectrons for a radiation of wavelength 4100Å is/are

Discuss the Millikan’s oil drop experiment to determine the charge of an electron.

What is the photoelectric effect?

How does photocurrent vary with the intensity of the incident light?

Consider two hydrogen atoms H_A and H_B in ground state. Assume that hydrogen atom H_A is at rest and hydrogen atom H_B is moving with a speed and make head-on collide on the stationary hydrogen atom H_A. After the strike, both of them move together. What is the minimum value of the kinetic energy of the moving hydrogen atom H_B, such that any one of the hydrogen atoms reaches one of the excitation state?

What is the shape of wavefront for point source?

What is the shape of wavefront for line source?

Give the definition of intensity of light according to quantum concept and its unit.

How will you define threshold frequency?

What is a photocell?

Mention the different types of photocells.

Define stopping potential.