Physics Test - ...

Process of emission of electrons from hot metal surface is called-

A point mass of 1 kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 ms⁻¹. Which of the following statement(s) is (are) correct for the system of these two masses?

Light of wavelength 200nm shines on an aluminium, 4.20eV is required to eject an electron. What is the kinetic energy of the fastest ejected electrons?

Hologram is based on phenomenon of

A ball moves over a fixed track as shown in the figure. From A to B the ball rolls without slipping. Surface BC is frictionless. K_A, K_B and Kc are kinetic energies of the ball at A, B and C, respectively. Then

If λ is the wavelength of hydrogen atom from the transition n = 3 to n = 1 then what is the wavelength for doubly ionised lithium ion for same transition?

Which of the following relates to photons both as wave motion and as a stream of particles?

A particle is moving along a vertical circular path of radius r. When the circular path is just completed:

The formula of kinetic mass of photon is? Where h is Planck's constant, v is frequency of the photon and c is its speed.

It is found that a body on an inclined plane just starts sliding down if inclination is sin⁻¹(3/5), then the angle of repose (friction) is

A thin ring of mass 2 kg and radius 0.5 m is rolling without slipping on a horizontal plane with velocity 1m/s. A small ball of mass 0.1 kg, moving with velocity 20 m/s in the opposite direction, hits the ring at a height of 0.75 m and goes vertically up with velocity 10 m/s. Immediately after the collision:

In an inelastic collision an electron excites a hydrogen atom from its ground state to a M-shell state. A second electron collides instantaneously with the excited hydrogen atom in the M-shell state and ionizes it. At least how much energy the second electron transfers to the atom in the M-shell state?

Work function of a metal is 5.2 × 10^-18 J then its threshold wavelength will be

In photoelectric effect, the photo current.

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 : (hc = 1240 eV.nm)