Dual Nature of Radiation and Matter

In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be

Photoelectric emission occurs only when the incident light has more than a certain minimum

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by

The threshold frequency for a photosensitive metal is 3.3 \(\times\) 1014 Hz. If light of frequency 8.2 \(\times\) 1014 Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly

A source S1 is producing, 1015 photons per second of wavelength 5000 \(\mathop A\limits^ \circ\). Another source S2 is producing 1.02 \(\times\) 1015 photons per second of wavelength 5100 \(\mathop A\limits^ \circ\). Then, (power of S...

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work functions 5.01 eV, when ultraviolet light of 200 nm falls on it, must be

A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by
(Where V is the potential difference betw...

When monochromatic radiation of intensity \(I\) falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2\(I\), the number of emitted electrons and t...

The electron in the hydrogen atom jumps from excited state (n = 3) to its ground state (n = 1) and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estim...

Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

The number of photo electrons emitted for light of a frequency \(\upsilon\) (higher than the threshold frequency \({\upsilon _0}\)) is proportional to

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 \(\times\) 106 m s\(-\)1. The velocity of the particle is

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

Monochromatic light of frequency 6.0 \(\times\) 1014 Hz is produced by a laser. The power emitted is 2 \(\times\) 10\(-\)3 W. The number of photons emitted, on the average, by the source per second is

A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move

A 5 watt source emits monochromatic light of wavelength 5000 \(\mathop A\limits^ \circ\). When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the num...

A photocell employs photoelectric effect to convert

In a discharge tube ionization of enclosed gas is produced due to collisions between

When photons of energy h\(\upsilon\) fall on an aluminimum plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of the ejected photoelectr...

The momentum of a photon of energy 1 MeV in kg m/s will be

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 \(\mathop A\limits^ \circ\) is/are

A photosensitive metallic surface has work function, h\(\upsilon\)0. If photons of energy \(2h{\upsilon _0}\) fall on this surface, the electrons come out with a maximum velocity of 4 \(\times\) 106 m/s. When the photon energy is increas...

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then

J.J. Thomson's cathode-ray tube experiment demonstrated that

The value of Planck's constant is

When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of

Which of the following is not the property of cathode rays ?

If particles are moving with same velocity, then which has maximum de Broglie wavelength?

Which one among the following shows particle nature of light?

In Thomson mass spectrograph \(\overrightarrow E \bot \overrightarrow B\) then the velocity of electron beam will be

A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emitted per second, will be

By photoelectric effect, Einstein proved

Who evaluated the mass of electron infirectly with help of charge