Physics question and answers for October 12, 2023
- Q 15 The work function for tungsten and sodium are 4 5 eV and 2 3 eV respectively If the threshold wavelength A for sodium is 5600 then the value of...
- Q 41 In a photoelectric experiment the relation between applied potential difference between cathode and anode V and the photoelectric current I was found to be shown in graph 3 2...
- Q a c n n 5 When light of wavelength 300 nm falls on a photoelectric emitter photoelectrons are liberated For another emitter light of wavelength 600 nm is sufficient for...
- Q A solar sail consists of a very light thin plane surface which can absorb all the photons incident on it Consider such a sail placed at a very large distance...
- Q In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number n 1 If n 1 the frequency of radiation...
- Q a the magnitude of b its kinetic energy in joule and in electron volt 14 Find de Broglie wavelength corresponding to the root mean square velocity of hydrogen molecules at...
- Q 29 In the arrangement shown in figure 42 E4 y 10 mm d 0 24 mm and D 12 m The work function of the material of the emitter is...
- Q 3 hv A metal surface of work function 1 07 eV is irradiated with light of wavelength 332 nm The retarding potential required to stop the escape of photo electron...
- Q Light from a monochromatic source is incident normally on a small photo sensitive surface S having work function If power of the source is W and a is the distance...
- Q 663 mW of light from a 540 nm source is incident on the surface of a metal If only 1 of each 5 x 10 incident photons is absorbed and...
- Q 3 The kinetic energy of the fastest moving photo electron from a metal of work function 2 8 eV is 2eV Calculate the value of kinetic energy if the frequency...
- Q c p d Both p and E decrease photoelectrons a inversely with the intensity and is independent of the frequency of the incident radiation b inversely with the frequency and...
- Q intensity of the 6 If the particles listed below all have the same kinetic energy which one would possess the shortest de Broglie wavelength a Deuteron c Proton b a...
- Q c a particle The energy that should be added to an electron t reduce its de Broglie wavelength from 1 nm to 0 5 nr 2005 is a four times...
- Q 3 h The work function of a certain metal is 2 3 eV If light of wave number 2 x 106 m 1 falls on it the kinetic energies of...
- Q 10 From the photoelectric effect we may infer correctly that KEA 71 1 Na and Al both have the same threshold frequency 2 Maximum kinetic energy for both the metals...
- Q 44 Consider a hydrogem like atom whose energy in 13 6Z2 2 n th n state is given by En When this excited atom makes a transition from excited state...
- Q If the wavelength of incident light changes from 4000 to 3100 change in stopping potential will be 0 35 V 0 9 V 0 40 V 0 1 V
- Q If photoelectric electrons are ejected from metals X and Y by light of frequency f the potential difference V required to stop the electrons is measured for various frequencies If...
- Q A light beam of intensity 20 W cm is normally normally on a perfectly incident reflecting surface of sides 25 cm x 15 cm The momentum imparted to the surface...
- Q 5 A 75 W light source emits light of wavelength 600 nm a Calculate the frequency of the emitted light b How many photons per second does the source emit
- Q 0 Across a photoelectric cell a source of variable potential difference is connected and the photoelectric current is plotted against the applied potential difference The graph in broken lines represents...
- Q A point source of light is placed at the centre of curvature of a hemispherical surface The radius of curvature is r and the inner surface is completely reflecting Find...
- Q 2 Show that it is not possible for a photon to be completely absorbed by a free electron
- Q 6 Which of the graphs shown below does not represent the relationship between incident light and the ejected from metal surface JEE Mains online 20 Number of electrons K E...
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