Physics question and answers for October 11, 2023
- Q 16 Maximum kinetic energy of a photoelectron is E when the wavelength of incident light is If becomes four times when wavelength is reduced to one third then work function...
- Q 10 kg ms 2013 The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 A The wavelength of the second spectral line in the...
- Q Consider a source emitting 100 W of green light at a wavelength of 500 nm The number of photons emerging from source per second is 1 2 5 10 9...
- Q 3 An electron of mass m when accelerated through a potential difference V has de Broglie wavelength The de Broglie wavelength associated with a proton of mass M accelerated through...
- Q D The diagram shows the energy level for an electron in a certain atom In which transition the energy emission is maximum 1 I 2 I 3 III IV n...
- Q Figure shows the graph of stopping potential versus the frequency for a photosensitive metal The plank s constant and work function of the metal are 1 2 4 V 2...
- Q 1 When a point source of monochromatic light is at a distance of 0 2 m from a photoelectric cell the cut off voltage and the saturation current are 0...
- Q A point source of light of power 3 2 milli watts emit energy 5eV If the source is located at a distance of 0 8m from the centre of metallic...
- Q 19 Calculate the energy radi minute by a blackbody of surface area 100 cm when it is maintained at 227 C 25
- Q 8 The ratio of frequencies of incident photons in V2 the graph shown will be K max 8 evt eV 7 eV 5 eV 6 eV V V2 v Hz
- Q The electric field at a point associated with light wave is given by E Eosin 2xftsin 2xfl whose work function is The velocity of fastest moving photoelectron ermitted will be...
- Q distance between source and The wavelength of photons in two cases are 4000 and 3600 respectively what is difference potential for these two
- Q When a metal is irradiated by monochromatic light the maximum kinetic energy of the photo electrons 1 2eV If frequency of the light is increased 50 then maximum kinetic energy...
- Q A 1 milliwatt laser source is emitting light of wavelength 555 nm The number of photons emitted per second are approximately Planck s constant 6 6 10 34 m Kg...
- Q 3 A and B are two metals with threshold frequencies 1 8 x 10 4 Hz and 2 2 x 1014 Hz Two identical photons of energy 0 825 eV...
- Q 21 A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils The recoil energy will be AIPMT Prelims 2011 1 hv 2 Mc hv...
- Q wer Q 11 Q 12 and Q 13 by appropriately matching the information given in the three columns of the following table Q 11 Q 12 13 Work functions of...
- Q 5 A source of power 600 kW emits photon which incident on a surface 2 5 m away out of which 50 is reflected back what is the radiation pressure...
- Q A beam of light has three wavelengths 4144 4972 6216 with a total intensity 3 6x10 W m equally distributed amongst the three wavelengths The beam falls normally on a...
- Q 18 36 54 In photoelectric effect experiment the frequency of incident light is three times of threshold frequency and saturation curren is i Now wavelength of light is made four...
- Q An electron and a proton are separated by a large distance and the electron approaches the proton with a kinetic energy of 4 11 eV If the electron is captured...
- Q In a common emitter CE amplifier having a voltage gain G the transistor used has transconductance 0 03 mho and current gain 25 If the above transistor is replaced with...
- Q 6 18 The magnetic field associated with a light wave is given at the origin by B B sin 3 14 107 ct sin 6 28 10 ct If this...
- Q Figure shows the variation of photoele i with anode potential V for a photosensitive surface for two radiations of intensities I and I and frequencies va and vo for the...
- Q 3 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 OTwo blocks are hanging by massless strings beam of light is allowed to fall as shown in figure Assuming that lower surface of lower block is perfectly reflecting and light...
- Q 1 potential versus Wavelength and reciprocal of slope of graph will be hc Straight line e 2 Rectangular hyperbola 3 Straight line graph of stopping is drawn Nature C e...
- Q An amplifier has a voltage gain A 1000 The voltage gain in dB is 1 30 dB 3 3 dB 2 60 dB 4 20 dB
- Q Answer Q 11 Q 12 and Q 13 by appropriately matching the information given in the three columns of the following table 11 12 Work functions of four metals are...
- Q Light of wavelength from a small 0 5mW He Ne laser source used in the school laboratory shines from a spacecraft of mass 1000 kg Estimate the time needed for...
- Q The work function of tungsten is 4 50 eV The wavelength of fastest electron emitted when light whose photon energy is 5 50 eV falls on tungster surface is 1...
- Q 9xme 2 16 Th present in different wave function for a hydrogen atom is In unit of the difference between energy levels corresponding from 3 to 2 total nodes
- Q The work function of a substance is 4 0 eV The longest wavelength of light that can cuas photoelectric emission from the substance i approximately 1 220 nm 2 310nm
- Q In the figure shown electromagnetic radiations of wavelength 200nm are incident on the metallic plate A The photo electrons are accelerated by a potential difference 10 2 eV These electrons...
- Q A light beam of wavelength 400 nm is incident on a metal plate of work function 2 2 eV A particular electron absorbs a photon and makes some collisions before...
- Q D Set The Food 146 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...
- Q 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 eV...
- Q 32 Figure shows the graph of stopping potential Vo vs frequency v of incident light The slope of the line equals a h energo b he he 2 c e...
- Q If is the thresholdwavelength forphotoelectric emission 2 the wavelength of light falling on the surface of a metalama m is the mass of the electron then the velocity of ejected...
- Q 19 The electron in the hydrogen atom jumps from excited state n 3 to its ground state n 1 and the photons thus emitted irradiate a photosensitive material If the...
- Q Frequency of a matter wave its equal to KE KE 2 KE h 2h h 1 2 3 4 2
- Q A and B in figure I and II represent two sets shaded area The output represented by the set Y in Figure III is realised by the logic gate 1...
- Q E A CD M The above is a plot of binding energy per nucleon E against the nuclear mass M A B C D E correspo to different nuclei Consider...
- Q 3 An electron hole pair is formed when light of maximum wavelength 6000 is incident on the The band gap energy of the semiconductor semiconductor a 4 eV is approximately...
- Q 6 The approximate wavelength of a photon of energy 2 48 eV is 1 500 3 2000 2 5000 A 4 1000
- Q 10 From the figure describing photoelectric effect we may infer correctly that Na Al VIL KEA 1 Na and Al both have the same threshold frequency 2 Maximum kinetic energy...
- Q 85 Surface of certain metal is first illuminated with light of wavelength 350 nm and then by light of wavelength 540 nm It is found that maximum speed of the...
- Q B Two towers on top of two hills are 40 km apart The line joining them passes 50 m above a hill halfway between the towers Longest wavelength of radio...
- Q The truth table for the orcuit shown in the figure is A B D
- Q The threshold frequency for a certain metal is 3 3 10 4 Hz If light of frequency 8 2 10 4 Hz incident on the metal then the cut off...
- Q A beam of unpolarised light having flux 103 watt falls normally on a polariser of cross sectional area 3 x 10 m The polariser rotates with an angular frequency of...
- Q PHOTO ELE The energy of photon of visible light with maximum wavelength in eV is 1 1 3 3 2 2 1 6 4 7
- Q of it e 4 5 10 22 44 The work functions for metals A B and C are respectively 1 92 eV 2 0 eV and 5 eV According to...
- Q The band gap in germanium is AE 0 68 eV Assuming that the number of hole electron pairs is proportional to e 4k 2kT find the percentage increase in the...
- Q 50 For incident frequency n stopping potential is v then for frequency n2 stopping potential is a V b V h n n e h n n e V 11...
- Q Photoelectric emission is observed for a metallic surface for frequency f and f If maximum kinetic energy of electrons in these two cases are in ratio of 1 n then...
- Q Explain the inverse linear dependence potential on the incident in a photoelectric effect of stopping wavelength experiment
- Q A difference of 2 3 eV separates two energy levels in an atom What is the frequency of radiation emitted when the atom make a transition from the upper level...
- Q he electrons that are used in an electron microscope are accelerated through a potential ifference of 63 0 kV Part A Calculate the speed of the electrons using the Newtonian...
- Q ng is directly related to the amount of energy contained within a single photon of light O the frequency of the photon what material the photon hits O the speed...
- Q What causes a gaseous element to emit light its emission spectrum electrons moving into the nucleus O electrons falling from a high energy level to a lower energy level O...
- Q A periodic wave has a wavelength of 8 4 m and a speed of 14 m s What is the period of the wave
- Q In a photoelectric effect experiment a beam of blue light is incident on a metal plate and does not eject electrons from the plate a State whether each of the...
- Q The speed of light is 3 108 m s Find the wavelength for a typical AM radio wave with a frequency of 800 kHz Answer in units of m Answer...
- Q The lowest energy photon that can ionize Carbon has an energy of 11 2603 eV What is the wavelength of this photon and in what part of the electromagnetic spectrum...
- Q D The Energy Level Diagram for Hydrogen is shown below Level n 8 n 6 n 5 n 4 n 3 n 2 lonization Ground State Energy eV 0 00...
- Q Electrons are accelerated from rest through an 8000 V potential difference Partsby By what factor would their de Broglie wavelength increase if they were instead accelerated through a 2000 V...
- Q How many sublevels are there with n 1 in an atom
- Q Part A Determine the energy in eV of a photon with a 650 nm wavelength E Submit Part B VAE Request Answer Determine the wavelength of a 6 0 keV...
- Q The arrows in the diagram is likely to result in continuous emission spectrum not predictable as there are to many energy states involved absorption spectrum line spectrum
- Q 4. During a photoelectric effect experiment, light possessing 2.53 eV of energy is incident on the photosensitive material. Electrons are emitted with an energy of 1.71 eV of energy. What...
- Q 3. The frequency of orange light is 5.01 x 104 Hz. How much-energy does a photon of orange light carry? (h= 6.626 x 10-34 J-s; 1 eV = 1.60 x...
- Q 9. During a photoelectric effect experiment, light possessing 2.53 eV of energy is incident on the photosensitive material. The work function of the material is 0.78 eV What is the...
- Q 2. What is the de Broglie wavelength of a 2.89 x 10-28 kg particle moving at 3.00 x 108 m/s? (h= 6.626 x 10-34 J-s)4.45 x 10-15 m7.65 x 10-15...
- Q 1. What is the de Broglie wavelength of a particle with a momentum of 1.11 x 10-10 kg-m/s? (h= 6.626 x 10^-34 J-s)5.17 x 10-24 m3.78 x 10-24 m5.96 x...
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