Limitations of Bohr's Model

Q.

What are the drawbacks of Bohrs atomic model?

Q. Statement $1:$ Davisson-Germer experiment established the wave nature of electrons.

Statement $2:$ If electrons have wavelength, they can exhibit interference and diffraction.

1. Statement $1$ is false, Statement $2$ is true.
2. Both statements are false.
3. Both statements are true and Statement $2$ is the correct explanation of Statement $1$
4. Both statements are true and Statement $2$ is not the correct explanation of Statement $1$

Q. Which of the following statements are incorrect regarding the Bohr's Atomic Model ?

1. Bohr's model ended up being unsuccessful due to its limitation for single electron systems
2. Bohr's Quantization rule was never validated by any theoretical evidence
3. Bohr's model was limited to absorption only from ground state of an atom
4. Bohr's model was a huge success as it could successfully explain the Hydrogen line spectra

Q. Which of the following is quantised according to Bohr’s theory of hydrogen atom

1. Linear velocity of electron
2. Angular velocity of electron
3. Angular momentum of electron
4. Linear momentum of electron

Q.

Positronium consists of an electron and a positron (a particle that has the same mass as an electron, but opposite charge) orbiting around their common center of mass. Calculate the value of the Rydberg constant for this system.

Q.

Bohrs model introduced the concept of quantization of ________

Q.

According to Bohr’s model of hydrogen atom, relation between principal quantum number ($n$) and radius of stable orbit is

1. $r$ Is proportional to $n$

2. $r$ is proportional to $n^2$

3. $r$ is proportional to $n^{-2}$

4. $r$ is proportional to $n^{-1}$

Q.

List out any two limitations of Bohr atom model.

Q. The electric potential between a proton and an electron is given by V=Vln{r/r} where r is a cnstant.assume bohr atom model is applicable to potential, then variation of radius Rn with the nth orbit with principal quantum number is

Q.

What is the difference between Bohr model and Quantum model?

Q. In a hydrogen atom, the electron has angular momentum given by $L=n\frac{h}{2\pi }$. Here, $n$ is,

1. always an integer
   
2. maybe an integer or fraction
   
3. rational number
   
4. real number
   

Q. Which of the following questions, the Bohr's atomic model was not able to provide an answer for:

1. Why electrons have a license to "not" follow Maxwell's law of radiation in certain orbits?
2. Why the transitions between certain orbits are more favorable?
3. Why does the electron revolve around the nucleus and can't remain stationary?
4. Why is it necessary for the electrons to emit a photon while transitioning from higher to lower orbits?

Q. In Bohr's atomic model, an electron jumps from $n=1$ to $n=3$, how much energy will be absorbed?

Q. According to Bohr's postulate -

1. The angular orbital momentum is integral multiple of $\frac{h}{4\pi }$
2. The angular orbital momentum is integral multiple of $\frac{h}{2\pi }$
3. The angular orbital momentum is integral multiple of $\frac{h}{\pi }$
4. The angular orbital momentum is integral multiple of $2\pi h$

Q. Quick question. The smallest possible value of angular momentum for an electron in the hydrogen atom, in appropriate units, is –

1. 
2. 
3. 
4. 

Q.

Explain the Physics of the atom.

Q. 2. What should be the angular momentum� of an electron in bohr hydrogen atom� whose energy is 0.544ev?

Q. Which of the following statements are incorrect regarding the Bohr's Atomic Model ?

1. Bohr's model was a huge success as it could successfully explain the Hydrogen line spectra
2. Bohr's model ended up being unsuccessful due to its limitation for single electron systems
3. Bohr's Quantization rule was never validated by any theoretical evidence
4. Bohr's model was limited to absorption only from ground state of an atom

Q. What are the limitations of Bohr's theory of a hydrogen atom?

Q. In Moseyls law $\sqrt{v}=a(z-b)$, the value of the screening constant for $K-$series and $L-$series of $X-$series rays are respectively :

1. $1,4$
2. $4,6$
3. $2,4$
4. $1,6.4$

Q. Who unified celestial and terrestrial mechanics?

1. James Clerk Maxwell
2. Sir Issac Newton
3. None of the above
4. Michael Faraday

Q. The magnetic field induction produced at the centre of orbit due to an electron revolving in $n^{th}$ orbit of hydrogen atom is prportional to

1. $n^{-3}$
2. $n^{-5}$
3. $n^5$
4. $n^3$

Q. Which of the following questions, the Bohr's atomic model was not able to provide an answer for:

1. Why electrons have a license to "not" follow Maxwell's law of radiation in certain orbits?
2. Why the transitions between certain orbits are more favorable?
3. Why does the electron revolve around the nucleus and can't remain stationary?
4. Why is it necessary for the electrons to emit a photon while transitioning from higher to lower orbits?

Q. The simple Bohr model is not applicable to ${}_3^{7}Li$ atom because

1. $Li$ is metal
2. $Li$ has neutral particles in nucleus
3. $Li$ has more than one $e^{-1}$
4. $Li$ is not a gas

Q. For the ground state, the electron in the $H-atom$ has an angular momentum=$h$, according to the simple Bohr model. Angular momentum is a vector and hence will be infinitely many orbits with the vector pointing in all possible directions. In actuality, this is not true,

1. Because Bohr model gives incorrect values of angular momentum
2. Base only one of these would have a minimum energy
3. Angular momentum must be in the direction of spin of electron
4. Because electrons go around only in horizontal orbits

Q. In a hypothetical system a particle of mass m and charge -3q is moving around a very heavy particle having charge q. Assuming Bohr's model to be time to this system, the orbital velocity of mass m when it is nearest to heavy particle is

1. $\frac{3q^2}{2{ϵ}_{0}h}$
2. $\frac{3q^2}{4{ϵ}_{0}h}$
3. $\frac{3q}{2{ϵ}_{0}h}$
4. $\frac{3q}{4{ϵ}_{0}h}$

Q. The value of Bohr Magneton is given by :

1. $eh/4\pi mc$
2. $e^{2}h/2\pi mc$
3. $e/4\pi m$
4. $eh/4\pi m$

Q. For the ground state, the electron in the H - atom has an angular momentum = h, according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbit with the vector pointing in all possible directions. In actually, this is not true,

1. because Bohr's model gives incorrect values of angular momentum.
2. because only one of these would have a minimum energy.
3. angular momentum must be in the direction of spin of electron
4. because electrons go around only in horizontal orbits.

Q. The simple Bohr model is not applicable to $H{e}^4$ atom because

1. $H{e}^4$ is an inert gas.
2. $H{e}^4$ has one more electron.
3. $H{e}^4$ has neutrons in the nucleus.
4. Electrons are not subject to central forces.

Q. Which of the following statements are incorrect regarding the Bohr's Atomic Model ?

1. Bohr's model was a huge success as it could successfully explain the Hydrogen line spectra
2. Bohr's model ended up being unsuccessful due to its limitation for single electron systems
3. Bohr's Quantization rule was never validated by any theoretical evidence
4. Bohr's model was limited to absorption only from ground state of an atom