MCQ
Photo-electric effect can be explained by
  • A
    Corpusular theory of light
  • B
    Wave nature of light
  • C
    Bohr's theory
  • Quantum theory of light

Answer

Correct option: D.
Quantum theory of light

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

At room temperature, copper has free electron density of $8.4 \times 10^{28}$ per $\mathrm{m}^3$. The copper conductor has a cross-section of 10. $m$ and carries a current of $5.4 \mathrm{~A}$. The electron drift velocity in copper is
The adjacent figure is the part of a horizontally stretched net. section $A B$ is stretched with a force of $10 N$. The tensions in the sections $B C$ and $B F$ are
If the Earth losses its gravity, then for a body
Let $\vec{C}=\vec{A}+\vec{B}$ then
A normally incident ray reflected at an angle of $90^{\circ}$. The value of critical angle is
A black body at a temperature of $227^{\circ} \mathrm{C}$ radiates heat energy at the rate of $5 \mathrm{cal} / \mathrm{cm}-\mathrm{sec}$. At a temperature of $727^{\circ} \mathrm{C}$, the rate of heat radiated per unit area in $\mathrm{cal} / \mathrm{cm}$ will be
A ring of radius $R$, made of an insulating material carries a charge $Q$ uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed $\omega $, then the magnitude of the magnetic moment of the ring is
Radius of the first orbit of the electron in a hydrogen atom is $0.53 \mathring A$. So, the radius of the third orbit will be
A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about
A pendulum clock keeps correct time at $0^{\circ} \mathrm{C}$. Its mean coefficient of linear expansions is $\alpha /{ }^{\circ} \mathrm{C}$, then the loss in seconds per day by the clock if the temperature rises by $t^{\circ} \mathrm{C}$ is