List of top Physics Questions on Bohr Model Of The Hydrogen Atom asked in CBSE CLASS XII

State Bohr’s second postulate and mention its significance.
Prove that, in Bohr model of hydrogen atom as principal quantum number \(n\) becomes large, the energy levels get closer and closer.
In Bohr model, electron transitions from $n=5$ to $n=1$ emit wavelength $\lambda$. What is wavelength for transition $n=5$ to $n=2$?
In Bohr model, for large $n$, spacing between consecutive orbits is proportional to
Assertion (A) : In Bohr model of hydrogen atom, the energy levels are discrete and quantised. Reason (R) : In a hydrogen atom, the electrostatic force on the electron provides the necessary centripetal force to it to revolve around the nucleus.
If Bohr's quantization postulate \(\left(L=\dfrac{nh}{2\pi}\right)\) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.
The energy of an electron in an orbit in hydrogen atom is \(-3.4\ \text{eV}\). Its angular momentum in the orbit will be:
Prove that, in Bohr model of hydrogen atom as principal quantum number \(n\) becomes large, the energy levels get closer and closer.
State Bohr’s second postulate and mention its significance.
In Bohr model, electron transitions from $n=5$ to $n=1$ emit wavelength $\lambda$. What is wavelength for transition $n=5$ to $n=2$?
In Bohr model, for large $n$, spacing between consecutive orbits is proportional to
Assertion (A) : In Bohr model of hydrogen atom, the energy levels are discrete and quantised. Reason (R) : In a hydrogen atom, the electrostatic force on the electron provides the necessary centripetal force to it to revolve around the nucleus.
If Bohr's quantization postulate \(\left(L=\dfrac{nh}{2\pi}\right)\) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.
The energy of an electron in an orbit in hydrogen atom is \(-3.4\ \text{eV}\). Its angular momentum in the orbit will be:
The radius of a nucleus of mass number 125 is:
The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:
Assertion : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion. Reason (R): For heavy nuclei, binding energy per nucleon increases with increasing \( Z \) while for light nuclei, it decreases with increasing \( Z \).