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Revision Quiz on Dual Nature of Matter and Radiation

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Question 1

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 2

The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

Question 3

The frequency and work function of an incident photon are v and φ0. If v0 is the threshold frequency, then necessary condition for the emission of photoelectron is

Question 4

An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λmin is the smallest possible wavelength of X-ray in the spectrum, the variation of log λmin with log V is correctly represented in:

Question 5

When photons of wavelength λ1 are incident on an isolated sphere, the corresponding stopping potential is found to be V. When photons of wavelength λ2 are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength λ3 is used then find the stopping potential for this case:

Question 6

For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?

Question 7

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

Question 8

When the momentum of a proton is changed by an amount p0, then the corresponding change in the de-Broglie wavelength is found to be 0.25%. The original momentum of the proton was

Question 9

In Thomson experiment of finding for electrons, beam of electrons is replaced by that of muons) particle with same charge as of electrons but mass 208 times that of electrons). No deflection condition in this case satisfied, if

Question 10

Photon of frequency v has a momentum associated with it. If c is the velocity of light, the momentum is

Question 11

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)

Question 12

Match List -1 (Fundamental Experiment) with List - II (its conclusion) and select the correct option from the choices given below the list:
  List- I   List -II
(A) Frank-Hertz Experiment (i) Particle nature of light
(B) Photo-electric Experiment (ii) Discrete energy levels of atom
(C) Davison-Germer Experiment (iii) Wave nature of electron
    (iv) Structure of atom

Question 13

The kinetic energy of a free electron doubles. Its deBroglie wavelength changes by the factor

Question 14

Which of the following radiations has the least wavelength?

Question 15

The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows :

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Oct 11JEE & BITSAT