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Class XII Physics Dual Nature of Radiation & Matter 2
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Question 1
If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength -
Question 2
Two sources A and B have same power. The wavelength of radiation of A is λa and that λb. The number of photons emitted per second by A and B are na and nb respectively, then -
Question 3
A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1/2 m away, the number of electrons emitted by photo cathode would
Question 4
A charged oil drop is suspended in a uniform field of 3 × 104 V/m so that it neither falls nor rises. The charge on the drop will be (take the mass of the charge = 9.9 × 10−15 kg and g = 10 m/s2)
Question 5
A photon of frequency f causes the emission of a photoelectron of maximum kinetic energy EK from a metal. If a photon of frequency 3f is incident on the same metal, the maximum kinetic energy of the emitted photoelectron
Question 6
The time taken by a photoelectron to come out after the photon strikes is approximately
Question 7
According to Einstein’s Photoelectric Equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency, of the incident radiation gives straight line whose slope
Question 8
The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function (in eV) of the metal is : (hc = 1240 eV.nm)
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Oct 11JEE & BITSAT
