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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 1

The energy of a photon of wavelength λ is [1988]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 2

The threshold frequency for photoelectric effecton sodium corresponds to a wavelength of5000 Å. Its work function is [1988]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 3

The de -Broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it [1989]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 4

Energy levels A, B, C of a certain atom correspond to increasing values of energy i.e., E_{A} < E_{B} < E_{C}. If λ_{1}, λ_{2}, λ_{3} are the wavelengths of radiation corresponding to the transitions C to B, B to A and C to A respectively, which of the following relation is correct? [1990, 2005]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 5

A radio transmitter operates at a freqency 880kHz and a power of 10 kW. The number ofphotons emitted per second is [1990]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 6

The momentum of a photon of an electromagneticradiation is 3.3 × 10^{–29} kgms^{–1}. What is thefrequency of the associated waves ? [h = 6.6 × 10^{–34} Js; c = 3 × 108 ms^{–1}) [1990]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 7

Consider an electron in the nth orbit of ahydrogen atom in the Bohr model. Thecircumference of the orbit can be expressed interms of de-Broglie wavelength λ of that electronas [1990]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 8

The wavelength of a 1 keV photon is 1.24 × 10^{–9} m. What is the frequency of 1 MeV photon ? [1991]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 9

Photoelectric work function of a metal is 1eV.Light of wavelength λ�� = 3000 Å falls on it. Thephoto electrons come out with velocity [1991]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 10

The cathode of a photoelectric cell is changedsuch that the work function changes from W_{1} toW_{2} (W_{2} > W_{1}). If the current before and afterchanges are I_{1} and I_{2}, all other conditionsremaining unchanged, then (assuming hν > W_{2})[1992]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 11

An ionization chamber with parallel conductingplates as anode and cathode has 5 × 10^{7} electronsand the same number of singly charged positiveions per cm3. The electrons are moving towards the anode with velocity 0.4 m/s. The currentdensity from anode to cathode is 4μA/m^{2}. Thevelocity of positive ions moving towardscathode is [1992]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 12

When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectronsare liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creatingphotoemission. What is the ratio of the work functions of the two emitters? [1993]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 13

Number of ejected photoelectron increases withincrease [1993]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 14

Momentum of a photon of wavelength λ is

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 15

In photoelectric effect the work function of ametal is 3.5 eV. The emitted electrons can bestopped by applying a potential of –1.2 V. Then[1994]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 16

Doubly ionised helium atoms and hydrogen ions are accelerated from rest through the same potential drop. The ratio of the final velocities of the helium and the hydrogen ion is [1994]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 17

Gases begin to conduct electricity at low pressurebecause [1994]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 18

Kinetic energy of an electron, which isaccelerated in a potential difference of 100 V is[1995]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 19

The wavelength associated with an electron,accelerated through a potential difference of 100V, is of the order of [1996]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 20

An electron of mass m and charge e is accelerated from rest through a potential difference of V volt in vacuum. Its final speed will be [1996]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 21

Which of the following statement is correct? [1997]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 22

Cosmic rays are [1997]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 23

The X-rays cannot be diffracted by means of anordinary grating because of [1997]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 24

In a photo-emissive cell, with exciting wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to the speed of the fastest emitted electron will be [1998]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 25

The 21 cm radio wave emitted by hydrogen ininterstellar space is due to the interaction called the hyperfine interaction in atomic hydrogen.The energy of the emitted wave is nearly [1998]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 26

Light of wavelength 5000 Å falls on a sensitiveplate with photo-electric work function of 1.9 eV.The kinetic energy of the photo-electronsemitted will be [1998]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 27

As the intensity of incident light increases [1999]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 28

The photoelectric work function for a metalsurface is 4.125 eV. The cut off wavelength forthis surface is [1999]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 29

Einstein work on the photoelectric effect provided support for the equation [2000]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 2 - Question 30

Which of the following moving particles (movingwith same velocity) has largest wavelength ofmatter waves? [2002]

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