Back to DUAL NATURE OF RADIATION AND MATTER

JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

1 Medium

1 of 1

Application +4 | -1

When a photon of wavelength 400 nm is incident on a metal surface, the electron emission takes place. The stopping potential to stop electron is 1.5 V. The work function of metal surface is: (given

h c=1240 \mathrm{~eV}-\mathrm{nm})

View answer and explanation

Correct option: B

1.6 eV

Option B (1.6 eV) is correct because it is calculated using the photoelectric effect equation, subtracting the stopping potential energy from the incident photon energy.

More Questions from DUAL NATURE OF RADIATION AND MATTER

Practice All Chapter MCQs →

The electrons are emitted in the photoelectric effect from a metal surface What is the de Broglie wavelength of a bullet of mass 0.04 kg travelling at the speed of 1 km/s? Photoelectrons are emitted from a metal surface when UV light of wavelength

\lambda=300 \mathrm{~nm}

is incident on it. The minimum negative potential required to stop the emission of electrons is

0.54 \mathrm{~V}

. Calculate:
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength

2000\,\mathop \mathrm{A}\limits^ \circ \,

Value of V is Two monochromatic beams

A

B

of equal intensity

I

, hit a screen. The number of photons hitting the screen by beam

A

is twice that by beam

B

. Then, what can inference you about their frequencies? A 5 W 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 1.0m, the number of photoelectrons liberated will be reduced by a factor of