JEE Mains Physics 2002-2019 Solved Video Solutions
An electron is in an excited state in a hydrogen-like atom is in an exited state. It has a total energy of -3.4 eV. Calculate
16
Sep
An electron is in an excited state in a hydrogen-like atom is in an exited state. It has a total energy of -3.4 eV. Calculate An electron is in an excited state in a hydrogen-like atom is in an exited state. It has a total energy of -3.4 eV. Calculate September 16, 2021 Category: Chapter [...]
A small quantity of solution containing 24Na radionuclide (half-life 15 h) of activity 1.0 microcurie is injected into the blood of a person. A sample of the blood of volume 1cm^3 taken after 5 h shows an activity of 296 disintegrations min^−1 . Determine the total volume of blood in the body of the person. Assume that the radioactivity solution mixes uniformly in the blood of the person. (1 curie =3.7×10^10 disintegrations^−1 )
16
Sep
A small quantity of solution containing 24Na radionuclide (half-life 15 h) of activity 1.0 microcurie is injected into the blood of a person. A sample of the blood of volume 1cm^3 taken after 5 h shows an activity of 296 disintegrations min^−1 . Determine the total volume of blood in the body of the person. [...]
A hydrogen like atom(atomic number Z) is in a higher excited state of quantum number n. The excited atom can make a transition to the first excited state by successively emitting two photons of energy 10.2 and 17.0 eV respectively. Alternatively, the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energies 4.25 eV and 5.95 eV respectively. Determine the values of n and Z. (lonization energy of H atom= 13.6 eV)
16
Sep
A hydrogen like atom(atomic number Z) is in a higher excited state of quantum number n. The excited atom can make a transition to the first excited state by successively emitting two photons of energy 10.2 and 17.0 eV respectively. Alternatively, the atom from the same excited state can make a transition to the second [...]
Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photo-electrons emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. Find:
16
Sep
Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photo-electrons emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. Find: Beta rays emitted by a radioactive material are. September 16, 2021 Category: Chapter 18 - Atoms [...]
Electrons in hydrogen like atom (Z=3) make transition from the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiation are incident normally on a metal plate and ejects photo-electrons. The stopping potential for the photo-electrons ejected by the shorter wavelength is 3.95 eV. Calculate the work function of the metal and stopping potential for the photo-electrons ejected by the longer wavelength.(R H =1.094 × 10^7 m^−1 )
16
Sep
Electrons in hydrogen like atom (Z=3) make transition from the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiation are incident normally on a metal plate and ejects photo-electrons. The stopping potential for the photo-electrons ejected by the shorter wavelength is 3.95 eV. Calculate the work function of [...]
A nucleus x initially at rest undergoes alpha decay according to the equation. A92X gives 228ZY + alpha (a) Find the value of A and Z in the above process.
16
Sep
A nucleus x initially at rest undergoes alpha decay according to the equation. A92X gives 228ZY + alpha (a) Find the value of A and Z in the above process. A nucleus x initially at rest undergoes alpha decay according to the equation. A92X gives 228ZY + alpha (a) Find the value of A and [...]
A beam of light has three wavelengths 4144 A o, 4972 A ˚ and 6216 A ˚ with a total intensity of 3.6×10^−3 Wm^−2 equally distributed amongst the three wavelengths. The beam falls normally on an area 1.0 cm^2 of a clean metallic surface of work function 2.3 eV. Assume that the there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate a number of photoelectrons liberated in two seconds.
16
Sep
A beam of light has three wavelengths 4144 A o, 4972 A ˚ and 6216 A ˚ with a total intensity of 3.6×10^−3 Wm^−2 equally distributed amongst the three wavelengths. The beam falls normally on an area 1.0 cm^2 of a clean metallic surface of work function 2.3 eV. Assume that the there is no [...]
It is proposed to use the nuclear fusion reaction, _1^2H+_1^2Hrarr_2^4He in a nuclear reactor 200 MW rating. If the energy from the above reaction is used with a 25 per cent efficiency in the reactor, how many grams of deuterium fuel will be needed per day?(The masses of _1^2H and _2^4He are 2.0141 atomic mass units and 4.0026 atomic mass units respectively.)
16
Sep
It is proposed to use the nuclear fusion reaction, _1^2H+_1^2Hrarr_2^4He in a nuclear reactor 200 MW rating. If the energy from the above reaction is used with a 25 per cent efficiency in the reactor, how many grams of deuterium fuel will be needed per day?(The masses of _1^2H and _2^4He are 2.0141 atomic mass [...]
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_1^2H+_1^2Hrarr_2^4He in a nuclear reactor 200 MW rating. If the energy from the above reaction is used with a 25 per cent efficiency in the reactor ,
how many grams of deuterium fuel will be needed per day?(The masses of _1^2H and _2^4He are 2.0141 atomic mass units and 4.0026 atomic mass units respectively.) ,
It is proposed to use the nuclear fusion reaction ,
A doubly ionised lithium atom is hydrogen-like with atomic number 3. (a) Find the wavelength of the radiation required to excite the electron in Li^2+ from the first to the third Bohr orbit. Given the ionisation energy of hydrogen atom as 13.6 eV.
16
Sep
A doubly ionised lithium atom is hydrogen-like with atomic number 3. (a) Find the wavelength of the radiation required to excite the electron in Li^2+ from the first to the third Bohr orbit. Given the ionisation energy of hydrogen atom as 13.6 eV. Beta rays emitted by a radioactive material are. September 16, 2021 Category: [...]
The ionization energy of a hydrogen like bohr atom is 4 Rydbergs. (i) What is the wavelength of the radiation emitted when the electron jumps from the first excited state to the ground state ? (ii) what is the radius of the orbit for this atom ?
16
Sep
The ionization energy of a hydrogen like bohr atom is 4 Rydbergs. (i) What is the wavelength of the radiation emitted when the electron jumps from the first excited state to the ground state ? (ii) what is the radius of the orbit for this atom ? Beta rays emitted by a radioactive material are. [...]