JEE Mains Physics 2002-2019 Solved Video Solutions
In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5×10^−12m, the minimum electron energy required is close to :
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Nov
In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5×10^−12m, the minimum electron energy required is close to : In an electron microscope the minimum electron energy required is close to the resolution that can be achieved is of [...]
The stopping potential V0 (in volt) as a function of frequency (v) for a sodium emitter, is shown in the figure. The work function of sodium, from the data plotted in the figure, will be : (Given : Planck’s constant (h) = 6.63 × 10^−34 Js, electron charge e = 1.6 × 10^−19 C)
29
Nov
The stopping potential V0 (in volt) as a function of frequency (v) for a sodium emitter, is shown in the figure. The work function of sodium, from the data plotted in the figure, will be : (Given : Planck’s constant (h) = 6.63 × 10^−34 Js, electron charge e = 1.6 × 10^−19 C) electron [...]
A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is : [Given Planck’s constant h=6.6×10^−34Js, speed of light c=3.0×10^8 m/s]
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Nov
A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is : [Given Planck’s constant h=6.6×10^−34Js, speed of light c=3.0×10^8 m/s] A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is : [...]
Light is incident normally on a completely absorbing surface with an energy flux of 25 W cm^−2. if the surface has an area of 25 cm^−2, the momentum transferred to the surface in 40 min time duration will be :
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Nov
Light is incident normally on a completely absorbing surface with an energy flux of 25 W cm^−2. if the surface has an area of 25 cm^−2, the momentum transferred to the surface in 40 min time duration will be : Light is incident normally on a completely absorbing surface with an energy flux of 25 [...]
In a photoelectric effect experiment the threshold wavelength of the light is 380 nm. If the wavelength of incident light is 260 nm, the maximum kinetic energy of emitted electrons will be: Given E (in eV) = 1237/ lamba (in nm)
29
Nov
In a photoelectric effect experiment the threshold wavelength of the light is 380 nm. If the wavelength of incident light is 260 nm, the maximum kinetic energy of emitted electrons will be: Given E (in eV) = 1237/ lamba (in nm) In a photoelectric effect experiment the threshold wavelength of the light is 380 nm. [...]
50 W/m^2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m^2 surface area will be close to (c=3×10^8m/s) :-
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Nov
50 W/m^2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m^2 surface area will be close to (c=3×10^8m/s) :- A particle 'P' is formed due to a completely inelastic [...]
A particle ‘P’ is formed due to a completely inelastic collision of particles ‘x’ and ‘y’ having de-Broglie wavelengths ‘λx’ and ‘λy’ respectively. If x and y were moving in opposite directions, then the de-Broglie wavelength of ‘P’ is :-
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Nov
A particle ‘P’ is formed due to a completely inelastic collision of particles ‘x’ and ‘y’ having de-Broglie wavelengths ‘λx’ and ‘λy’ respectively. If x and y were moving in opposite directions, then the de-Broglie wavelength of ‘P’ is :- A particle 'P' is formed due to a completely inelastic collision of particles 'x' and [...]
The electric field of light wave is given as E =10^−3cos(2πx/5×10^−7 −2π×6×10^14t)x^NC. This light falls on a metal plate of work function 2eV. The stopping potential of the photo-electrons is : Given, E (in eV) = 12375/λ(inA)˙
28
Nov
The electric field of light wave is given as E =10^−3cos(2πx/5×10^−7 −2π×6×10^14t)x^NC. This light falls on a metal plate of work function 2eV. The stopping potential of the photo-electrons is : Given, E (in eV) = 12375/λ(inA)˙ E (in eV) = 12375/λ(inA)˙ The electric field of light wave is given as E =10^−3cos(2πx/5×10^−7 −2π×6×10^14t)x^NC. This [...]
Two particles move at right angle to each other. Their de-Broglie wavelengths are λ1 and λ2 respectively. The particles suffer perfectly inelastic collision. The de-Broglie wavelength λ, of the final particle, is given by :
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Nov
Two particles move at right angle to each other. Their de-Broglie wavelengths are λ1 and λ2 respectively. The particles suffer perfectly inelastic collision. The de-Broglie wavelength λ, of the final particle, is given by : is given by of the final particle Two particles move at right angle to each other. Their de-Broglie wavelengths are [...]
If 13.6eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is
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Nov
If 13.6eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is If 13.6eV energy is required to ionize the hydrogen atom then the energy required to remove an electron from n = 2 is November 28, 2020 Category: Chapter 18 - Atoms and [...]