Photoelectric Effect Questions and Answers

Electrons emitted due to absorption of energy of radiation will have a maximum kinetic energy g is work function v is frequency of incident radiation 1 Kmas hu 2 Kmax hv 3 Kmax hu 4 Kmax hu

Intensity of light is 1 number of photons falling over an area in Is 2 number of photons falling over an area 3 number of photons falling over unit area in unit time 4 number of photons emitted by source in 1 s

Five elements A B C D and E have work functions 1 2 eV 24eV 3 6eV 4 8eV and 6eV respectively If light of wavelength 4000 A is allowed to fall on these elements then photoelectrons are emitted by O A B and C

The maximum wavelength of radiation that can produce photoelectric effect in certain metal is 200 nm The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be O 12 4 eV O 6 2 eV O 100 eV

3 The spectral emissive power E for a body at temperature T is plotted against the wavelength and area under the curve is found to be A At a different temperature T the area is found to be 625A Then 21 2 2 1 5 dE d 2 1 T T 2 1 5 3 1 5 4 5 20 21

Which of the following statements about photoelectric effect is are correct I When electron emission occurs the rate of emission of photoelectrons proportional to the intensity of is electromagnetic radiation incident on the metal II Electrons are emitted only when the incident electromagnetic radiation has a wavelength larger than some threshold value III Electrons are emitted only when the incident electromagnetic radition has an intensity greater than some threshold value A I only B II only C I and III only

The figure shows different graphs between stopping potential Vo and frequency v for photosensitive surface of cesium potassium sodium and lithium The plots are parallel Which of the following about their work function is correct V 1 Cesium i Potassium Sodium iv Lithium 5 0 5 2 5 4 5 6 5 8 1 i ii iii iv 2 i iii ii iv 3 iv iii ii i 4 i iii ii iv 10 Hz

Let the potential energy of a hydrogen atom in the ground state be zero Then its energy in the first excited state will be 1 10 2 eV 3 23 8 eV 2 13 6 eV 4 27 2 eV

Threshold wavelength of a metal surface is 5 10 7 m When it is illuminated by light of wavelength 3 x 10 7m stopping potential is Vo what will be stopping potential if wavelength of incident light is doubled Question Type Single Correct Type Vo

In a photoelectric effect experiment the stopping potential is 1 37 V if the light used to illuminate the cathode has wavelength 475 nm Find the work function in eV of the cathode material Express your answer in electron volts Submit Part F AEO Request Answer eV Find the stopping potential if the wavelength is decreased to 425 nm

Question Type Single Correct Type 1 Does not depend on the frequency of the incident light 2 Does not depend on nature of cathode material Depends on both the frequency of 3 incident light and nature of cathode material 4 Depends upon the intensity of incident

If the radiations of wavelength 3100 and 6200 are incident on a substance of work function 1eV one by one then the ratio of the stopping potentials for the emitted photoelectrons will be approx Question Type Single Correct Type 1 3 1 2 4 1 3 6 1

The plots of intensity versus wavelength for three black bodies at temperature T T2 and T3 respectively are as shown in figure their temperature are such that O T T T3 O T T T O T T T T T T3 O

electron m 9 109 10 31 kg is confined in a one dimensional infinite square well of width L Enm determine uncertainty in momentum OPTIONS 0 7 10 26 kgm s

velength of matter waves is also determined by using kinetic energy as formula is h 2mE If you double the kinetic energy of a particle how does the deBroglie wavelength change OPTIONS A 2 1 707 A 1 A 2 0 707 X 1 A 2 1 5 A 1

Ho 7 View In English A black body is at a temperature of 5760 K The energy of radiation emitted by the body at wavelength 250 nm is U at wavelength 500 nm is U and that at 1000 nm is U3 Wien s constant b 2 88 100 Which of the following is correct 2 3 Correct Answor 4 Your Answor 3 Status incorrect U 0 U3 0 U U 24