Chapter Test: Dual Nature of Matter and Radiation - 2 JEE Physics Free

When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and

2v respectively. The work function of the metal is - (h = Planck's constant, c = velocity of light in air)

When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters ?

The threshold frequency for a certain metal is v₀. When light of frequency V = 2v₀ is incident on it, the maximum velocity of photoelectrons is 4 × 106 m/s. If the frequency of incident radiations is increased to 5v₀, then the maximum velocity of photoelectrons in m/s will be -

When radiation of wavelength λ is incident on a metallic surface, the stopping potential is 4.8 volts. If the same surface is illuminated with

radiation of double the wavelength, then the stopping potential becomes 1.6 volts. Then the threshold wavelength for the surface is -

If K₁ and K₂ are the maximum kinetic energies of photoelectrons emitted when lights of wavelength λ₁ and λ₂ respectively incident on a metallic surface and λ₁ = 3λ₂ , then -

The figure shows the variation of photo current with anode potential for a photo-sensitive surface for three different radiations. Let Ia, I_b and I_c be the intensities and f_a, f_b and f_c be the frequencies for the curves a, b and c respectively -

In the following diagram if V₂ > V₁ then -

If the distance of a 100 watt lamp is increased from a photo cell, the saturation current I in the photocell varies with the distance d as -

The stopping potential (V₀) versus frequency (v) plot of a substance is shown in figure, the threshold wavelength is –

Maximum velocity of the photoelectrons emitted by a metal surface is 1.2 × 10⁶ ms^–1 . Assuming the specific charge of the electron to be 1.8 × 10¹¹

C Kg^–1, the value of the stopping potential in volt will be -

A cesium photocell, with a steady potential difference of 60 V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1 m away, the photoelectrons emitted from the cell -

Let n_r and n_b be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.

10^-3 W of 5000 Å light is directed on a photoelectric cell. If the current in the cell is 0.16 mA, the percentage of incident photons which produce photoelectrons, is

The stopping potential for the photo electrons emitted from a metal surface of work function 1.7eV is 10.4 V. Identify the energy levels corresponding to the transitions in hydrogen atom which will result in emission of wavelength equal to that of incident radiation for the above photoelectric effect

A point source causes photoelectric effect from a small metal plate. Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the metal?

Photons with energy 5eV are incident on a cathode C, on a photoelectric cell. The maximum energy of the emitted photoelectrons is 2eV. When photons of energy 6eV are incident on C, no photoelectrons will reach the anode A if the stopping potential of A relative to C is