Physics question and answers for October 13, 2023
- Q Determine the number of photons emitted p wavelength 650 nm and has a power output a 6 54 10 5 photons s b 5 23 10 7 photons s c...
- Q 2 2 2 Photoelectrons are observed to just emit out of a material surface when the light of 620 nm falls on it with the intensity of 100 W m2...
- Q Suppose that a ray of blue colour is emitted during the transition of electron from n 6 to n 4 in He Which electronic transition in Balmer series of hydrogen...
- Q Please give explaination for correct answer and why not rest option plea se explain each option with reason a nd diagram Figure shows four situations in which charged particles are...
- Q A solar cell consists of a very light thin plane surface which can absorb all the photons incident on it Consider such a cell placed at a very large distance...
- Q 2 2 Photoelectrons are observed to just emit out of a material surface when the light of 620 nm falls on it with the intensity of 100 W m If...
- Q When monochromatic radiation of intensity and frequency falls on a surface number of photoelectron and their kinetic energy are N and T respectively If frequency of a monochromatic radiation is...
- Q Example 6 Ultraviolet light of wavelength 350 mm and intensity 1 00 W m is directed at a potassium surface If 0 50 of the incident photons produce photoelectrons how...
- Q LION A photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies Reason R The work function of metal varies as...
- Q The threshold wavelength of a certain metal is 6600 A The photoelectric work function for the metal will be 3 x 10 m s Th 6 6 x A O...
- Q The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate Light source is put on and a saturation photocurrent is recorded An electric field...
- Q 6 362x10 19 J 226 eV 2ma Example 2 An electron is confined in a cubical box of side 1A 1 Find its lowest energy ii what is the temperature...
- Q The work function of metal A atomic number x and metal B atomic number y are 4 3 eV and 3 1 eV respectively The ratio of slopes of the...
- Q Example 25 In a Stern Gerlach experiment a collimated beam silver atom is produced by vapourising silver salt in a furnace at 1200 C If the beam travels 100cm use...
- Q Photoelectrons are emitted from a given metal surface when it is illuminated by two beams P and Q of light both having the same frequency The saturation value of the...
- Q All electrons ejected from a surface by incident light of wavelength 200 nm can be stopped before travelling 1 m in the direction of uniform electric field of 4 N...
- Q COLLISION LOSS OF K E PROBLEM A metal ball of mass 2 kg moving with speed of 36 km h has a head on collision with a stationary ball of...
- Q Light of wavelength 500 nm is incident on a met li with work function 2 28 eV The de Broglie wavelength of the emitted electron is 1 2 8 x...
- Q The threshold wavelength for photoelectric 27 emission from a material is 5200 Photo electrons will be emitted when this material is illuminated with monochromatic radiation from a A 50 watt...
- Q Light of frequency 1 5 times the threshold frequency is incident on a photosensitive material What will be the photoelectric current if the frequency is halved and intensity is doubled...
- Q 4 In photoelectric effect stopping potential is 3 volt and wavelength used is wavelength of light becomes 22 then stopping potential becomes 1 volt Find threshold wavelength a 12420 A...
- Q 9 Photons with energy 5 eV are incident on a cathode C in a photoelectric cell The maximum energy of emitted photoelectrons is 2 eV When photons of energy 6...
- Q Which of the following statements is correct regarding the photoelectric effect experiment The photocurrent increases with intensity of light of a given frequency Stopping potential increases with increase in intensity...
- Q 70 The work function for metal X Y and Z are 2 5 eV 4 28 eV and 3 3 eV respectively The maximum kinetic energy of electrons emitted from...
- Q d number of electrons emitted is a quarter of the initial number 16 Light of wavelengths falls on a metal having work he A function Photoelectric effect will take place...
- Q mivien two polarisers a 30 b 45 c 22 5 d 60 88 Light from sodium lamp is made to pass through two polaroids placed one after the other in...
- Q 2 Choose correct relation for given i and V graph i photoelectric current V Accelerating potential difference A1 A2 Wavelengths of incident light 1 2 2 3 2 A 2...
- Q 6 A plano convex lens is made of flint glass Its focal length is a inversely proportional to the wavelength of light b longer for red than for blue c...
- Q 30 180 The work function of a surface of a photosensitive material is 9 0 eV The wavelength of the incident radiation for which the stopping potential is 3 V...
- Q In Millikan s oil drop experiment an oil drop of mass 16 10 6 kg is balanced by an electric field of 106 Vm The charge in coulomb on the...
- Q 1 1 In the experiment of photon kmax is Ko If frequency is increased by factor n then kax is nako Find work function max 1 2 K n 3...
- Q 19 A particle X of mass m and initial velocity u collide with another particle Y of mass which is at rest The 3m 4 collision is head on and...
- Q Photoelectric effect experiments are performed using two different plates of silver and sodium having work functions 4 6 eV and 2 3 eV respectively A light beam of wavelength 200...
- Q A parallel beam of radiation is incident on a highly conducting sphere of unknown emissivity The intensity of incident radiation on sphere is 912 W m Take stefan Boltzman constant...
- Q If frequency of incident light is constant then choose the correct option Photo current Maximum kinetic energy O Maximum kinetic energy Intensity Intensity Both 1 2 Intensity
- Q 33 Photons of energy 7 eV are incident on two metals A and B with work functions 6 eV and 3 eV respectively The minimum de Broglie wavelengths of the...
- Q In Millikan s oil drop experiment an oil drop of radius r and charge Q is held in equilibrium between the plates of a charged parallel plate capacitor when the...
- Q C 2 d 4 44 When photons of energy hy fall on an aluminum plate of work function E photoelectrons of maximum kinetic energy K are ejected If the frequency...
- Q Two particles A and B of de Broglie wavelength X and AB are in motion in one dimension They combine to form a particle C This process conserves momentum The...
- Q Which one of the following is true in photoelectric emission A Photoelectric current is directly proportional to the amplitude of light of a given frequency Photoelectric current is directly proportional...
- Q Does not depend on the frequency of the incident light Does not depend on nature of cathode material O Depends on both the frequency of incident light and nature of...
- Q Question 32 When monochromatic light of intensity I and frequency v 3vo Vo is the threshold frequency is incident on the cathode in a photoelectric experiment setup the saturation current...
- Q 158 Light of wavelength 500 nm is incident on a metal with work function 2 28 eV The de Broglie wavelength of the emitted electron is a 2 8 10...
- Q Two particles A and B of de Broglie wavelength X and ar in motion in one dimension They combine to form a particle C This process conserves momentum The incorrect...
- Q 3 2 10 C 4 2 x 10 C 23 When a high energy UV photon beam enters an electric field it will be 24 1 accelerated 3 undeflected Two...
- Q The ionisation energies of K shell for cobalt copper and molebdenum are 7 8 9 0 and 20 1 keV respectively If any metal out of these is used as...
- Q 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 2011...
- Q The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface having work function 5 01 eV when ultraviolet light of 200 nm falls...
- Q 47 The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations Which one of the 2009 following is a correct...
- Q 73 A particular electromagnetic radiation with wavelength 200 nm a has a higher frequency than radiation with wavel 400 nm b is in the visible region of the electromagnetic spectrum...
- Q A beam of light of wavelength 400 nm and power 1 55 mW is directed at the cathode of a photoelectric cell If only 10 of the incident photons effectively...
- Q 0 An electron of mass m and a photon have the same energy E in the range of a few eV The ratio of the de Broglie wavelength associated with...
- Q 2 By how much would the stopping potential for a given photosensitive surface go up if the frequency of the incident radiations were to be increased from 4 10 5...
- Q For photoelectric effect in sodium the figure shows the plot of cut off voltage versus frequency of incident radiation Calculate i threshold frequency ii work function for sodium Cut off...
- Q A parallel beam of monochromatic light of wavelength 6620 A striking a metal surface perpendicular has an intensity of 900 W m The number of photon striking the matal surface...
- Q Example 11 2 The work function of caesium is 2 14 eV Find the threshold frequency for caesium and the wavelength of the incident light if the photocurrent is brought...
- Q 41 Wave nature of light cannot explain photoelectric effect because in photoelectric effect it is seen that 1 For the frequency of light below a certain value the photoelectric effect...
- Q b Hydrogen atoms are excited with an electron beam of energy 12 5ev Find a the highest energy level up to which the hydrogen atoms will be excited c Find...
- Q In the given graph of the photoelectric experiment the maximum energy of emitted photoelectron will be 1 2 eV 2 0 eV 3 4 eV 443 144 3 2 1...
- Q mistry 10 Mathematic 30 English 5 Qs A beam of electromagnetic waves with a frequency of 6 28 x 10 15 Hz incident on a metal surface What is the...
- Q 1 When a metallic surface is illuminated with light of wavelength the stopping potential is V When the same surface is illuminated by light of wavelength 22 the stopping potential...
- Q 1 Light in certain cases may be considered as a stream of particles called photons Each photon has a linear momentum h where h is the Planck s constant and...
- Q 11 Let K be the maximum kinetic energy of photoelectrons emitted by light of wavelength 2 and K2 corresponding to wavelength 2 If A 2 2 then b K 2K...
- Q The retarding potential for having zero photo electric current 1 3 orrect Answer 4 ur Answer 3 aatus incorrect is proportional to the wavelength of incident light increases uniformaly with...
- Q Suppose a beam of electrons with each electron having energy E is incident on a metal surface kept in an evacuated chamber Then electrons can be emitted with any energy...
- Q Exercise 13 2 Calculate the probability that in the example of Rutherford scattering just given an alpha particle is scattered through an angle greater than 10 2 radian in the...
- Q An electron in the hydrogen atom jumps from excited state n to the ground state The wavelength so emitted illuminates a photosensitive material having work function 2 75 eV If...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
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