Physics question and answers for October 12, 2023
- Q 27 The energy flux of sunlight reaching the surface of the earth is 1 388 x 10 W m How many photons nearly per square metre are incident on the...
- Q The de Broglie wavelength and kinetic energy of a particle is 2000 and 1 eV respectively If its kinetic energy becomes 1 MeV then its de Broglie wavelength becomes Question...
- Q The potential difference between the plates of a parallel plate capacitor is changing at the rate of 106 V s If the capacitance is 2uF the displacement current in the...
- Q When light of frequency 2v and intensity Lilluminates a metal in a photoelectric experiment the stopping potential is 2 V and saturation current is 3 mA Now If the frequency...
- Q A parallel beam of electromagnetic radiation of wavelength 200 nm is incident on a perfectly reflecting surface The power incident on 1 mm area is 5 x 10 watts Find...
- Q The relation between time and displacement for two particles is given by y 0 06 sin 2 0 04t q Y 0 03 sin 2 1 04t The ratio of...
- Q nucleon E against the nuclear mass M A B C D E F correspond to different nuclei Consider four reactions i A B C E ii C A B iii...
- Q In a Compton scattering experiment the wavelength of the incident photon is 65 0 pm and the wavelength of the scattered photon is 69 0 pm Calculate the kinetic energy...
- Q Photons with energy 5 eV are incident on cathode C in a photoelectric cell The maximum energy of emitted photoelectrons is 2 eV When photons of energy 6 eV are...
- Q When a photon of wavelength 3000 A is incident on a metal surface an electron of energy 0 5 eV is emitte If a photon of wavelength of 2000 A...
- Q 3 A piece of metal has a cutoff wavelength of Acutoff 450 mm Consider illuminating this piece of metal with two different wavelengths of light a 1 500 nm beam...
- Q A parallel beam of monochromatic light of wave length 500 nm is incident normally on a perfectly absorb surface The power through any cross section of the beam is 10...
- Q When you shine 300 nm light on an electrode surface photoelectrons are emitted How many of the metals from the table might the electrode be Explain Potassium 2 30 eVSodium...
- Q If threshold wavelength for a photosensitive plate is 4000 A what will be the value of saturation current if radiation of wavelength 5000 is incident 1 Zero 2 1 mA...
- Q 22 Find the number of electrons emitted per second by a 24 W source of monochromatic light of wavelength 6600 A assuming 3 efficiency for photoelectric effect take h 6...
- Q You shine a monochromatic light with a wavelength of 207 nm on a metal surface The maximum kinetic energy of the electrons emitted from the metal is 6 4x10 19...
- Q Silver has a work function fo 4 7 eV When ultraviolet light of wavelength 100 nm is incident upon it a potential of 7 7 volt is required to stop...
- Q A light detector has an absorbing area of 4 0 x 106 m and absorbs 40 of the incident light which is at wavelength 500 nm The detector faces an...
- Q 3 Light with an energy flux of 20 W cm falls on a non reflecting surface at normal incidence If the surface has an area of 30 cm the total...
- Q 24 The magnetic field associated with a light wave is given at the origin by 0 B B sin 3 14 x 107 ct sin 6 28 107 ct If...
- Q 2 Find the photon energy in units of electron volts of electromagnetic waves of wavelength 40m a 3 10 8 eV c 3 2x10 8 eV b 3 1x10 8...
- Q c 106 W d 107 W 3 A perfectly reflecting mirror has an area of 1 cm Light energy is allowed to fall on it for 1 h at the...
- Q A sample of hydrogen atoms is irradiated with light with wavelength 86 8 nm and electrons are observed leaving the gas Each hydrogen atoms were initially in its ground level...
- Q 8 If velocity of a galaxy relative to earth is 1 2 x 10 ms then increase in wavelength of light from galaxy as compared to the similar source on...
- Q 1 What is the the frequency in kHz of gamma ray radiation that has a wavelength of 0 01516 nanometers The speed of light is 3 00x10 m s 8...
- Q 6 The photoelectric threshold wavelength of a certain metal is 3000 If the radiation of 2000A is incident on the metal a Electrons will be emitted b Positron will be...
- Q n 60 The threshold frequency for a certain photosensitive metal is v When it is illuminated by light of frequency V 2v the maximum velocity of photoelectrons is V What...
- Q photo sensitive surface is receiving light of wavelength 5000 at the rate of 10 7 Js The number of photons ejected per second is a 2 5 10 2 b...
- Q to 45 The collector of the photocell in photoelectric experiment is made of tungsten while the emitter is of platinum having work function of 10 eV Monochromatic radiation of wavelength...
- Q 3 37 If light of wavelength of maximum intensity emitted from a surface at temperature T is used to cause photoelectric emission from a metallic surface the maximum kinetic energy...
- Q 48 In the following arrangement y 1 0 mm d 0 24 mm and D 1 2 m The work function of the material of the emitter is 2 2...
- Q 2 NO 22 The adjoining figure shows the variation of photo current with anode potential for a photosensitive surface for three different radiations Let I I and I be the...
- Q 2 15 Monochromatic light of frequency fis incident on emitter having threshold frequency fo The kinetic energy of ejected electron will be a hf b h f f c hf...
- Q 1 Photoelectric emission is observed from a metallic surface for frequencies v and v of the incident light v v If the maximum values of kinetic energy of the photoelectrons...
- Q Is True but the Reason is False D If both Assertion and Reason are False 1 Assertion The strength of photoelectric current depends upon the intensity of incident radiation Reason...
- Q 6 Assertion Light described at a place by the equation E E sin cot sin 7cot falls on a metal surface having work function The maximum kinetic energy of the...
- Q EP 3 Consider a 100 W bulb emitting light in all directions Suppose that a metallic Na surface is kept at a distance of 1m from the bulb Estimate the...
- Q The potential energy of a particle of mass m is given by U x 0 x 1 and x 1 respectively If the total mechanical energy of particle is 2Eo...
- Q An isolated conducting sphere is bombarded by photons of 180nm wavelength As electrons are ejected the sphere will become charged If the Binding Energy of the sphere material is 4...
- Q greater ener A TV station is operated at 100 MW with a signal frequency of 10 MHz Calculate the number of photons radiated per second by its antenna
- Q A moving hydrogen atom absorbs a photon and comes to rest What is the maximum possib wavelength of photon hc 12420 eV Find wavelength in Your Answer 9 132 Correct...
- Q 1 5mW of 4000 A light is directed at a photoelectric cell If 0 10 percent of the incident photons produce photoelectrons find current in the cell Given h 66...
- Q Q7 90 In the given figure the energy levels of hydrogen atom have been shown along with some transitions marked as AB C D E 0 54 eV 0 85...
- Q A certain metal has a Fermi energy of 3 50 eV Find the number of electrons per unit volume with energy between 4 50 eV and 4 60 eV for...
- Q Suppose radiation from a black body is allowed to fall on a photosensitive material after passing it through a filter which selects the wavelength having maximum intensity to pass The...
- Q What is the work function of the metal if the light of wavelength 4000 generates photoelectrons of velocity 6 x 105 ms 1 form it Mass of electron 9 x...
- Q 3 A beam of electromagnetic radiation of intensity 6 4 x 10 5 W cm is comprised of wavelength 310 nm It falls normally on a metal work function 2eV...
- Q The electric field associated with a monochromatic beam becomes zero 1 2 10 5 times per second Find the maximum kinetic energy of the photoelectron when this light falls on...
- Q a De exci www photon emitted emitted photon energy hf E E tion Excited states are usually very unstable Within about 10 6s the electron will fall back to a...
- Q 1 Light of wavelength 0 6 m from a sodium lamp falls on a photocell and causes the emission of photoelectrons for which the stopping potential is 0 5 V...
- Q 6 Light of wavelength 330 nm falling on a piece of metal ejects electrons with sufficient energy which requires voltage Vo to prevent them from reaching a collector In the...
- Q value 9 The kinetic energies of the photoelectrons ejected from a metal surface by light of wavelength 2000 range from zero to 3 2 x 10 19 Joule Then find...
- Q Two separate monochromatic light beams A and B of the same intensity are falling normally on a unit area of a metallic surface Their wavelength are and respectively Assuming that...
- Q The de broglie wavelength of electrons striking the cathode to produce x rays is equal minimum wavelength of x ray produced What is the voltage across x ray tube in...
- Q When light of intensity 1 W m and wavelength 5 10 7m is incident on a surface it is completely absorbed by the surface If 100 photos emit one electron...
- Q The surface temperature of the sun is To and it is at an average distance d from a planet The radius of the sun is R If 0 is the...
- Q 4 5 mW of 400 nm light is directed at a photoelectric cell If 0 10 of the incident photons produce photoelectrons the current in the cell is 1 1...
- Q U 4 A beam of monochromatic light of wavelength 6600A is incident normally on a perfectly absorbing surface The power of the beam is 30 W The number of photons...
- Q Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 2 50 m away If the first order maxima are separated by 1 43 m on the...
- Q In the following YDSE arrangement y 1 mm d 0 24 mm and D 1 2 m If the light emitted from the source S is incident on the photo...
- Q periment of photo electric effect Kmax for photo electrons is Ko If frequency of light is doubled then Ka of Kmax if frequency of light is trippled 4 Ko 5...
- Q An electron of mass m with an initial velocity 4 V voi vo 0 enters an electric field Ei E constant 0 at t 0 If is its de Broglie...
- Q 19 A radioactive material of half life T was produced in a nuclear reactor at different instants the quantity produced second time was twice of that produced first time If...
- Q The energy equivalent of 0 5 g of a substance 1 0 5 1013 J Jon s 2 4 5 1016 J 3 4 5 x 1013 J 4 1...
- Q 3 When a light beam of frequency v is incident on a metal surface photoelectrons are emitted If these electrons describe a circle of radius r in a magnetic field...
- Q A beam of light has two wavelength 4972 and 6216 A with a total intensity of 3 6 x 10 3 Wm 2 equally distributed among the two wavelengths The...
- Q 89 Light of wavelength strikes a photoelectric surface and electrons are ejected with an energy E If E is to be increased to exactly twice its original value the wavelength...
- Q A photon has the same wavelength as the de Broglie wavelength of electron Given that c speed of light and v speed of electron Which of the following relation is...
- Q Using radiation of wavelength 3500 it is observed that the maximum kinetic energy of the emitted photoelectrons is 1 6 eV for potassium Calculate the work function of the metal...
- Q A photosensitive metallic surface has work function 6 If photon of energy 30 fall on this surface the electron comes out with a maximum velocity of 6x 106 ms When...
- Q D The work function of a metal is 1 eV Light of wavelength 3000 is incident on this metal surface The velocity of emitted photoelectrons will be a 10 ms...
- Q eV If radiations of 2000 A fall on the metal then the kinetic energy of the fastest photo electron is 1 1 6 x 10 19 J 2 16 x...
- Q 59 From the figure describing photoelectric effect we may infer correctly that Stopping potential Na Al 0 0 Frequency a Na and Al both have the same threshold frequency b...
- Q Select the correct statements Pleas e find the question in the image below 11 Select the correct statements 1 In the energy levels of a certain atom when the system...
- Q a A gas of hydrogen atoms in their ground state is bombarded by electrons with kinetic energy 12 5 eV What emitted wavelengths would you expect to see b What...
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