JEE Mains Physics 2002-2019 Solved Video Solutions
In a photon electric experiment set up , photons of energy 5 eV falls on the cathode having work function 3 eV (a) if the saturation current is i= 4 mu A for intensity 10^(-5) W/m^(2), then plot a graph between anode potential and current (b) Also draw a graph for intensity of incident radiation 2 x 10^(-5) W/m^(2)
16
Sep
In a photon electric experiment set up , photons of energy 5 eV falls on the cathode having work function 3 eV (a) if the saturation current is i= 4 mu A for intensity 10^(-5) W/m^(2), then plot a graph between anode potential and current (b) Also draw a graph for intensity of incident radiation [...]
Tags:
In a photon electric experiment set up ,
photons of energy 5 eV falls on the cathode having work function 3 eV (a) if the saturation current is i= 4 mu A for intensity 10^(-5) W/m^(2) ,
then plot a graph between anode potential and current (b) Also draw a graph for intensity of incident radiation 2 x 10^(-5) W/m^(2) ,
Wavelengths belonging to Balmer series lying in the range of 450 nm to 750 nm were used to eject photoelectrons from a metal surface whose work function is 2.0 eV. Find ( in eV ) the maximum kinetic energy of the emitted photoelectrons. (“Take hc = 1242 eV nm.”)
16
Sep
Wavelengths belonging to Balmer series lying in the range of 450 nm to 750 nm were used to eject photoelectrons from a metal surface whose work function is 2.0 eV. Find ( in eV ) the maximum kinetic energy of the emitted photoelectrons. (“Take hc = 1242 eV nm.”) Beta rays emitted by a radioactive [...]
A hydrogen-like atom (described by the Bohr model) is observed to emit six wavelengths, originating from all possible transitions between a group of levels. These levels have energies between –0.85 eV and –0.544 eV (including both these values). (a) Find the atomic number of the atom. (b) Calculate the smallest wavelength emitted in these transitions. (Take hc = 1240 eV.nm. Ground state energy of hydrogen atom = – 13.6 eV)
16
Sep
A hydrogen-like atom (described by the Bohr model) is observed to emit six wavelengths, originating from all possible transitions between a group of levels. These levels have energies between –0.85 eV and –0.544 eV (including both these values). (a) Find the atomic number of the atom. (b) Calculate the smallest wavelength emitted in these transitions. [...]
A nucleus at rest undergoes alpha decay emitting an alpha particle of de Broglie wavelength lemba = 5.76 * 10^-15 m. If the mass of the daughter nucleus is 223.610 amu and that of the alpha particle is 4.002 amu, determine the total kinetic energy in a final state. Hence obtain the mass of the parent nucleus in amu.
16
Sep
A nucleus at rest undergoes alpha decay emitting an alpha particle of de Broglie wavelength lemba = 5.76 * 10^-15 m. If the mass of the daughter nucleus is 223.610 amu and that of the alpha particle is 4.002 amu, determine the total kinetic energy in a final state. Hence obtain the mass of the [...]
In a nuclear reactor, 235U undergoes fission liberating 200 MeV of energy. The reactor has a 10% efficiency and produces 1000 MW power. If the reactor is to function for 10 years, find the total mass of uranium required.
16
Sep
In a nuclear reactor, 235U undergoes fission liberating 200 MeV of energy. The reactor has a 10% efficiency and produces 1000 MW power. If the reactor is to function for 10 years, find the total mass of uranium required. 235U undergoes fission liberating 200 MeV of energy. The reactor has a 10% efficiency and produces [...]
A hydrogen like atom of atomic number z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. Find n, z and the ground state energy (in eV) for this atom. Also calculate the minimum energy (in eV) that can be emitted by this atom during de-excitation. Ground state energy of hydrogen atom is -13.6 eV.
16
Sep
A hydrogen like atom of atomic number z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. Find n, z and the ground state energy (in eV) for [...]
Tags:
A hydrogen like atom of atomic number z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to quantum state n ,
a photon of energy 40.8 eV is emitted. Find n ,
z and the ground state energy (in eV) for this atom. Also calculate the minimum energy (in eV) that can be emitted by this atom during de-excitation. Ground state energy of hydrogen atom is -13.6 eV. ,
When a beam of 10.6 eV photons of intensity 2.0 W/m^2 falls on a platinum surface of area 1.0 x 10^-4 m^2 and work function 5.6 eV, 0.53% of the incident photons eject photo electrons. Find the number of photo-electrons emitted per second and their minimum and maximum energies (in eV). Take 1 eV = 1.6 x 10^-19 J.
16
Sep
When a beam of 10.6 eV photons of intensity 2.0 W/m^2 falls on a platinum surface of area 1.0 x 10^-4 m^2 and work function 5.6 eV, 0.53% of the incident photons eject photo electrons. Find the number of photo-electrons emitted per second and their minimum and maximum energies (in eV). Take 1 eV = [...]
Tags:
0.53% of the incident photons eject photo electrons. Find the number of photo-electrons emitted per second and their minimum and maximum energies (in eV). Take 1 eV = 1.6 x 10^-19 J. ,
When a beam of 10.6 eV photons of intensity 2.0 W/m^2 falls on a platinum surface of area 1.0 x 10^-4 m^2 and work function 5.6 eV ,
Nuclei of a radioactive element A are being produced at a constant rate α The element has a decay constant λ At time t=0, there are N0 nuclei of the element. (a) Calculate the number N of nuclei of A at time t is
16
Sep
Nuclei of a radioactive element A are being produced at a constant rate α The element has a decay constant λ At time t=0, there are N0 nuclei of the element. (a) Calculate the number N of nuclei of A at time t is Nuclei of a radioactive element A are being produced at a [...]
The element curium 96Cm248 has a mean life of 10^13 seconds. Its primary decay modes are spontaneous fission and α-decay, the former with a probability of 8% and the latter with probability of 92%. Each fission releases 200 MeV of energy. The masses involved in α-decay are as follows:
16
Sep
The element curium 96Cm248 has a mean life of 10^13 seconds. Its primary decay modes are spontaneous fission and α-decay, the former with a probability of 8% and the latter with probability of 92%. Each fission releases 200 MeV of energy. The masses involved in α-decay are as follows: The element curium 96Cm248 has a [...]
Assume that the de-Broglie was associated with an electron can forma standing wave between the atoms arranged in a one dimensional array with nodes at each of the atomic sites. It is found that one such standing wave is formed if the distance d between the atoms of the array is 2 Å. A similar standing wave is again formed if d is increased to 2.5 Å but not for any intermediate value of d. Find the energy of the electron in eV and the least value of d for which the standing wave of the type described above can form.
16
Sep
Assume that the de-Broglie was associated with an electron can forma standing wave between the atoms arranged in a one dimensional array with nodes at each of the atomic sites. It is found that one such standing wave is formed if the distance d between the atoms of the array is 2 Å. A similar [...]