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Dual Nature of Matter — JEE Main & Advanced NSEP PYQs

20 previous year questions from Dual Nature of Matter with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

20 questionsNSEPSolutions on every page

Ultraviolet light of wavelength 300 nm and intensity 1 ~W / m ^2 falls on the surface of a photosensitive material. If one percent of the incident photons produce photoelectrons th

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In an X ray tube the electrons are expected to strike the target with a velocity that is 10 % of the velocity of light. The applied voltage should be

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Which of the following curves represents spectral distribution of energy of black body radiation?

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The force of attraction between the positively charged nucleus and the electron in a hydrogen atom is given by f=k e^2 r^2 . Assume that the nucleus is fixed. The electron, initial

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The photoelectric threshold wavelength of tungsten is 230 nm . The energy of electrons ejected from its surface by ultraviolet light of wavelength 180 nm is:

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The energy of the characteristic X-ray photon in a Coolidge tube comes from

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The maximum wavelength that can ionize a hydrogen atom initially in the ground state is

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The wavelength of the waves associated with a proton and a photon are the same. Therefore, the two have equal

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The mass of an electron can be expressed as(where c is speed of light in vacuum) (where c is speed of light in vacuum)

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In an experiment on photoelectric effect, the slope of straight line graph between the stopping potential and the frequency of incident radiation gives

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A number of identical absorbing plates are arranged in between a source of light and a photo cell. When there is no plate in between, the photo current is maximum. Under the circum

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In a nuclear reaction, two photons each of energy 0.51 MeV are produced by electron-positron annihilation. The wavelength associated with each photon is

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The phenomenon inverse to photo electric effect is

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A source emits photons of energy 5 eV which are incident on a metallic sphere of work function 3.0 eV . The radius of the sphere is r =8 10⁻³ ~m . It is observed that after some ti

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Obtain the value of e ^2 2 ₀ hc

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A hydrogen atom ( M_ I I =1.67 10⁻²³ ~kg ), initially at rest, emits a photon and goes from the excited state n=5 to the ground state. The recoil speed of the atom is nearly

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In an experimental set up to study the photoelectric effect a point source of light of power 3.2 mW is used. The source emits mono energetic photons of energy 5 eV and is located a

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Continuous and Characteristic X - rays are produced when electron beam accelerated by a high potential difference of V volt (say) is made to hit the metallic target such as Molybde

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A parallel beam, of 6.0 mW radiation of wavelength 200 nm and of area of cross-section 1.0 ~mm ^2 , falls normally on a plane metallic surface. If the radiations are completely ref

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During the processes of annihilation of a stationary electron of mass m₀ with a stationary positron of equal mass, a radiation is emitted. The wavelength of the resulting radiation

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