Physics question and answers for October 14, 2023
- Q 14 Given a photon with wavelength 520 nm find the energy and momentum of the photon What equivalent mass would a particle have if all the energy of the photon...
- Q initially contain equal number of nuclei X has a half life of 1 hour and Y has a half life of 2 hours After two hours the ratio of the...
- Q 1 Photons of energy of 6 eV are incident on a metal surface whose work function is 4 eV The minimum kinetic energy of the emitted photo electrons will be...
- Q Q9 What is the frequency associated with a photon of energy 3 3 10 10 J Given h 6 626 10 34 Js ans 5 10 23Hz Q10 Light of...
- Q In relativistic mechanics m fefTm equivalent relation in electricity for electric charge is af 1 q 90 3 90 9 2 mo mo 2 q 4 q a grea the...
- Q Q 110 What is the stopping potential for photo Q 110 1 2 eV in Grafi icdaci fax Prich fand aur electrons ejected from a metal of work function 1...
- Q When radiation of wavelength is incident on a photo sensitive metallic surface the stopping potential is 3 6 volt If the same surface is illuminated with radiation of double wavelength...
- Q A positron a proton and an a particle are accelerated from rest by same potential A difference If ep and a are their respective de Broglie wavelengths then which of...
- Q Beam of light of wavelength incident on a photosensitive work function 2 eV Maximum kinetic 200 nm is surface of energy of photoelectron is 1 6 2 eV 2 2...
- Q Work function of a metal surface is 2 eV When light of frequency is incident on the surface maximum kinetic energy of photoelectrons emitted is 5 eV If the frequency...
- Q An electron in an atom makes transition from the energy state E E to E 1 5 E The wavelength of the emitted photon is Only one correct answer A...
- Q If the radiations of wavelength 200 nm and nm are incident on a substance of work funct 2 eV one by one then the ratio of the stopp potentials for...
- Q In the circuit shown in figure if the diode forward voltage drop i then the voltage difference between A and B is 5 KQ 5 kn www www B A...
- Q O In an experiment on photoelectric effect photons of wavelength 300 nm eject electron from a metal of work function 2 25 eV A photon of energy equal to that...
- Q Consider a hypothetical annihilation of a stationary electron with a stationary positron What is the wavelength of resulting radiation 1 2 3 4 h 2moc h moc 2h moc h...
- Q In a photelectric experiment measurement shows that all the ejected electrons have nonzero kinetic energy What can you say about the photelectric current Photo electric current is decreasing Cannot predict...
- Q 12 In the diagram shown a uniform electric field E has been applied along the width of the two parallel metal plates The work function of the metal plates is...
- Q transmitted into radiation and went into one quantum 12 Calculate the De Broglie wavelength associated with an electron of energy 5 Me m 9 1x10 kg h 6 62 10...
- Q If energy of incident photon is increased by 30 then the kinetic energy of photoelectrons ejected from the surface is increased from 0 2 eV to 0 85 eV The...
- Q 9 Observe the current versus voltage graphs of two photocells receiving same intensity of a monochromatic beam You may consider the plate area receiving light to be same Which of...
- Q 11 Photons corresponding to the first five transitions of Balmer series are incident on a metal plate which has work function 3eV What will the number of photoelectrons emitted if...
- Q 67 Two batteries one of emf 18 V and internal resistance 2 Q and the other of emf 12 V and internal resistance 1 2 are connected as shown The...
- Q In a photoelectric experiment set up photons of energy 5 eV falls on the cathode having work function 3 eV i If the saturation current is i 4 A for...
- Q Light of intensity 10 5W m falls on a sodium photocell of surface area 2cm Assuming that top 5 layers of sodium absorb the incident energy the estimated time required...
- Q E 2c V 1 Eph Ee 2 Eph 2C 3 Pph 4 Pe Pph ph 2V is n If the distance between the soruce and the cell is doubled then...
- Q A positron of 1MeV collides with an electron of 1 MeV and gets annihilated and the reaction produces two y ray photons If the effective mass of each photon is...
- Q The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0 710 V When the incident wavelength is changed to a new...
- Q Light with an energy flux of 6 W cm2 falls on a non reflecting surface at normal incidence If surface has an area of 50 cm What total momentum transferred...
- Q Photons of wavelength y are incident on a metal The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic...
- Q Question No In the circuit shown in figure if the diode forward voltage drop is 0 3 V then the voltage difference between A and B is 5 KQ www...
- Q 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 emitted...
- Q In a photo electric experiment under condition of saturation current we consider two different cro section A B as shown VA and vg represents average speed of electrons at two...
- Q The L S and Jquantum numbers corresponding to the ground state electronic configuration of Boron Z 5 are a L 1 S 1 2 J 3 2 c L 1...
- Q A beam of mono energetic particles having speed v is described by the wave function y x u x exp ikz where u x is a real function This corresponds...
- Q A proton and an o particle are accelerated through the same potential difference The ratio of de Broglie wavelength Ap to that is NCERT Pg 400 1 2 1 2...
- Q Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4cm If the intensity of light is 150 milliwatt m which photons strike the surface O...
- Q 4 1 10 m s An electron is moving with an initial veloci V val enters in a uniform magnetic fie A B Then its de Broglie waveleng INGERT Pg...
- Q In a photoelectric experiment the stopping potential V versus applied frequency v graph for three different metals A B C are as shown The metal with maximum threshold wavelength is...
- Q A hydrogen atom initially at rest and free to move in the second excited state It comes to ground state by emitting a photon then the momentum a hydrogen atom...
- Q In a black body radiation at certain temperature T 1 the wave length having maximum intensity of radiation equals 9000A When the temperature is increased from TitoT the total radiation...
- Q Violet light can cause photoelectric emission from a metal but blue light cannot If sodium light is incident on the metal then A The photoelectric current decreases B The number...
- Q Question No 13 The potential at a point A is 10 V and at another point B is 12 V An electron free to move in the region passes point...
- Q 42 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...
- Q 19 Choose the correct statement for the given i photoelectric current and V accelerating potential difference graph where and 2 are wavelengths of incident light 1 2 2 3 2...
- Q work functions 2 0 eV d 2 5 eV and 3 0 eV respectively A light beam containi Photoelectric effect experiments are performed using three different metal plates p q...
- Q No 2 View In English An X rays tube operates at 20 KV A particular electron loses 5 of its kinetic energy to emit an X rays photon at the...
- Q 5 terms of temperature are given below 1500 T AP k 10 5 e 1000 BQ K 10 4 e T If initially t 0 both reaction started with same...
- Q beam of white light is incident on glass air interface from glass to air such that green light just suffers total internal reflection The colours of the light which will...
- Q Electromagnetic radiations of longest wavelength is Radio waves Visible radiation Infrared radiation hr min OT Rays
- Q 4 4 Maximum work is required to move q in figure c The de Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T Kelvin...
- Q 5 In an experiment on photoelectric effect the stopping potential is measured for monochromatic light beams corresponding to different wavelengths The data collected are as follows wavelength nm 350 400...
- Q An electron mass m with initial velocity vector v voi Voj is in an electric field vector E Eok If Xo is initial de Broglie wavelength of electron its de...
- Q When a monochromatic point source of light is at a distance of 0 2 m from a photoelectric cell the cut off voltage and saturation current are respectively 0 6...
- Q A photoelectric cell is illuminated by a point source of light 1 m away When the source is shifted to 2m then 1 each emitted electron carries one quarter of...
- Q 3 Let P and E denotes the linear momentum an energy of photon If the wavelength is decreased 1 Both P and E decrease 2 Both P and E increase...
- Q Which of the following statements are incorrect about the photoelectric effect A The kinetic energy of photo electron depends on nature of metal The number of photoelectrons in proportional to...
- Q 11 A graph regarding photo electric effect is shown between the maximum kinetic energy of electrons and frequency of the incident light On the basis of data shown in graph...
- Q Online Mock Test Series for NEET 2020 15 Two different radiations having wavelength less than threshold wavelength are incident on similar t photoelectric cells If both cells are receiving same...
- Q emitted due to Maximum kinetic energy of photoelectron from the surface of work function incidence of light of frequency v is E If the frequency of incident light is doubled...
- Q 4 All the three are possible 5 Sodium and copper have work functions 2 3 eV and 4 6 eV respectively Then the ratio of their threshold wavelengths is nearest...
- Q Two particles A and B are in motion If the wavelength associated with particle A is 5 x 10 8 m calculate the wavelength associated with particle B if its...
- Q If a source of power 4kW produces 1020 1 3 4 Correct Answer 2 Your Answer 4 Status incorrect v rays X rays Ultraviolet rays Microwaves photons second the radiation...
- Q Ans 1 35 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...
- Q In a photoelectric experiment a parallel beam of monochromatic light with power of 200 W is incident on a perfectly absorbing cathode of work function 6 25 eV The frequency...
- Q 2 21 The maximum kinetic energy of the photoelectrons ejected will be eV when light of wavelength 350 nm is incident on a cesium surface Work function of cesium 1...
- Q In a photoelectric effect experiment for a certain cathode material stopping potential V as a function of frequency f of light used is shown What is the wo function in...
- Q 5 The light photons of energy 1 eV and 2 5 eV respectively are made incident on metallic plate of work function 0 5 eV one after another The ratio...
- Q Radiation of wavelength Ao 3 being the threshold wavelength is incident on a photosensitive metallic sphere of radius R The charge developed on the sphere when electrons cease to be...
- Q measurement shows that all the ejected electrons have nonzero kinetic energy What can you say about the photelectric current Cannot predict the state of photoelectric current Photo current decreasing electric...
- Q A parallel beam of photons of intensity I strike a plane surface at angle 45 to the surface If plane surface have reflection coefficient 0 5 then pressure exerted by...
- Q 20 In a standard photoelectric emission set up the metal has threshold wavelength 22 where is the wavelength of incident radiation The accelerating potential is such that it increases the...
- Q The cut off wavelength for a metal is 5000A When light of wavelength 3000 falls on it the maximum kinetic energy of the ejected photoelectron is E When light of...
- Q Question If power of the source wavelength of light surface area and photoelectric efficiency of the metal of the plate are adjusted to 60 W 6000 0 04 m and...
- Q Why iss the second option correct Bcoz number of photo electrons depends on intensity not v right Correct graphs regarding photo electric effect is are Kinetic energy 11 L Number...
- Q Example A rod is moving with speed w r t ground such that velocity of rod is parallel to its length C An observer is also running in the same...
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!