JEE Mains Physics 2002-2019 Solved Video Solutions
The potential energy of particle of mass m varies as The de-Broglie wavelength of the particle in the range 0≤x≤1 is λ1 and that in the range x>1 is λ2 . If the total energy of the particle is 2E0 , find λ1/λ2 .
15
Sep
The potential energy of particle of mass m varies as The de-Broglie wavelength of the particle in the range 0≤x≤1 is λ1 and that in the range x>1 is λ2 . If the total energy of the particle is 2E0 , find λ1/λ2 . find λ1/λ2 . The potential energy of particle of mass m [...]
Characteristic X-rays of frequency 4.2×10^18 Hz are produced when transitions from L-shell to K-shell take place in a certain target material. Use Mosley’s law to determine the atomic number of the target material. Given Rydberg constant R =1.1×10^7 m^(-1).
15
Sep
Characteristic X-rays of frequency 4.2×10^18 Hz are produced when transitions from L-shell to K-shell take place in a certain target material. Use Mosley’s law to determine the atomic number of the target material. Given Rydberg constant R =1.1×10^7 m^(-1). Beta rays emitted by a radioactive material are. September 15, 2021 Category: Chapter 18 - Atoms [...]
At a given instant, there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei reduces to 12.5%. Calculate (a) the mean life of the nuclei is
15
Sep
At a given instant, there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei reduces to 12.5%. Calculate (a) the mean life of the nuclei is At a given instant there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei reduces [...]
There is a stream of neutrons with a kinetic energy of 0.0327 eV. If the half life of neutron is 700 s, what fraction of neutrons will decay before they travel a distance of 10 m?
15
Sep
There is a stream of neutrons with a kinetic energy of 0.0327 eV. If the half life of neutron is 700 s, what fraction of neutrons will decay before they travel a distance of 10 m? There is a stream of neutrons with a kinetic energy of 0.0327 eV. If the half-life of neutron is [...]
A uranium nucleus (atomic number 92, mass number 238) emits an alpha-particle and the resultant nucleus emits a beta-particles. What are the atomic and mass numbers of the final nucleus? .
15
Sep
A uranium nucleus (atomic number 92, mass number 238) emits an alpha-particle and the resultant nucleus emits a beta-particles. What are the atomic and mass numbers of the final nucleus? . A uranium nucleus (atomic number 92 mass number 238) emits an alpha-particle and the resultant nucleus emits a beta-particles. What are the atomic and [...]
Consider a hydrogen atom with its electron in the nth orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc = 1242 eV nm)
15
Sep
Consider a hydrogen atom with its electron in the nth orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc = 1242 eV nm) Consider a hydrogen atom with its electron in the [...]
Consider a hydrogen-like ionized atom with atomic number Z with a single electron. In the emission spectrum of this atom, the photon emitted in the n = 2 to n = 1 transition has energy 74.8eV higher than the photon emitted in the n = 3 to n = 2 transition. The ionization energy of the hydrogen atom is 13.6eV. The value of Z is ____________.
15
Sep
Consider a hydrogen-like ionized atom with atomic number Z with a single electron. In the emission spectrum of this atom, the photon emitted in the n = 2 to n = 1 transition has energy 74.8eV higher than the photon emitted in the n = 3 to n = 2 transition. The ionization energy of [...]
A hydrogen atom in its ground state is irradiated by light of wavelength 970 A. Taking hc/e = 1.237 * 10^-6 eV m and the ground state energy of hydrogen atom as -13.6 eV, the number of lines present in the emission spectrum is
15
Sep
A hydrogen atom in its ground state is irradiated by light of wavelength 970 A. Taking hc/e = 1.237 * 10^-6 eV m and the ground state energy of hydrogen atom as -13.6 eV, the number of lines present in the emission spectrum is A hydrogen atom in its ground state is irradiated by light [...]
An electron in an excited state of Li^2+ ion has angular momentum 3h/2π. The de Broglie wavelength of the electron in this state in pπα0 (where α0 is the Bohr radius). The value of p is :
15
Sep
An electron in an excited state of Li^2+ ion has angular momentum 3h/2π. The de Broglie wavelength of the electron in this state in pπα0 (where α0 is the Bohr radius). The value of p is : An electron in an excited state of Li^2+ ion has angular momentum 3h/2π. The de Broglie wavelength of [...]
The work functions of Silver and Sodium are 4.6 and 2.3 eV, respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is
15
Sep
The work functions of Silver and Sodium are 4.6 and 2.3 eV, respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is respectively. The ratio of the slope of the stopping potential versus frequency plot for Silver to that of Sodium is The work functions [...]