MCQ
Which theory explained that electrons revolved in circular orbits?
  • A
    Einstein theory
  • Bohr theory
  • C
    Rydberg theory
  • D
    De $–$ Broglie theory

Answer

Correct option: B.
Bohr theory
Niels Bohr explained the line spectrum of the hydrogen atom with the assumption that electrons revolved around an atom in circular orbits and that the orbit closer to the nucleus represented the ground state and the farther orbits represented the higher levels of energy.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A closed loop $PQRS$ carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments $PS, SR$ and $RQ$ are $F_1, F_2$ and $F_3$ respectively and are in the plane of the paper and along the directions shown, the force on the segment $QP$ is
The $I-V$ characteristic of an $LED$ is
A solid hemisphere of refractive index $\frac{3}{2}$ and radius $R = 20\  cm$ is placed as shown in the figure. Another special cylindrical glass of refractive index $'\mu '$, radius $R$ and thickness $\frac{{2R}}{3}$ is also placed adjacent to flat surface of solid hemisphere. There is a very small luminous spot at $'P'$ just inside the solid hemisphere and $MN$ surface of special glass surface is silvered. (consider only paraxial rays)
While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure:
The charges on two sphere are +7mC and – 5mC respectively. They experience a force F. If each of them is given and additional charge of – 2mC, the new force of attraction will be
A step up transformer has transformation ration $5 : 3$ What is voltage in secondary if voltage in primary is $60 \,V$.......$V$
The magnetic field B with in the solenoid having n turns per metre length and carrying a current of i ampere is given by
Asteroids are
The capacity of the parallel plate capacitor increases when:
Diameter of the moon is $3.5\times10^3\, km$ and its distance from earth is $3.8\times10^5\, km$. It is seen by a telescope whose objective and eyepiece have focal lengths $4\, m$ and $10\, cm$ respectively. What will the angular diameter of the image of the moon?.......$^o$