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# Class XII Physics Dual Nature of Radiation and Matter Quiz 5

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Question 1

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on and a saturation photo-current is recorded. An electric field is switched on which has vertically downward direction , then

Question 2

From the following graph of photo current against collector plate potential, for two different intensities of light I1 and I2, one can conclude

Question 3

An electron accelerated under a potential difference V volt has a certain wavelength λ. Mass of proton is some 2000 times of the mass of the electron. If the proton has to have the same wavelength λ, then it will have to be accelerated under a potential difference of

Question 4

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively, successively illuminate a metallic surface whose work function is 0.5 eV. Ratio of maximum speeds of emitted electrons will be

Question 5

During charging a capacitor, variations of potential V of the capacitor with time t is shown as

Question 6

In Moseley’s law for characteristic X-rays is √ν = a(Z – b)

Question 7

A particle A of mass m and initial velocity v collides with a particle B of mass which is at rest. The collision is head on, and elastic. The ratio of the de-Broglie wavelengths after the collision is:

Question 8

de-Broglie wavelength of an electron accelerated by a voltage of 50 V is close to
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