MCQ
Photoelectric effect was explained by :
  • A
    Newton
  • Einstein
  • C
    Planck
  • D
    Bohr

Answer

Correct option: B.
Einstein
(B) - Einstein

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 cylindrical conductor of radius $'R'$ carries a current $'i'$. The value of magnetic field at a point which is $R/4$ distance inside from the surface is $10\,T$. Find the value of magnetic field at point which is $4R$ distance outside from the surface
The amplitude of magnetic field in an electromagnetic wave propagating along $y$-axis is $6.0 \times 10^{-7}\,T$. The maximum value of electric field in the electromagnetic wave is:
Given $L_1 = 1\, mH, R_1 = 1\,\Omega , L_2 = 2\,mH, R_2 = 2\,\Omega $ Neglecting mutual inductance the time constants (in $ms$) for circuit.....$ms$
As shown, the circuit is made of $8$ different resistors. It is found that when $R_1 = 4\,\,\Omega,$ the resistance between $A$ and $B$ is $2\,\,\Omega.$ Now replace $R_1$ by a $6\,\,\Omega$ resistor, what is the resistance between $A$ and $B$?
In an elastic collision:
If $t_{1/2}$ is the half life of a substance then $t_{3/4}$ is the time in which substance
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
In the circuit shown in figure, the heat produced in 5 ohm resistance is 10 calories per second. The heat produced in 4 resistance is

$PQ$ and $RS$ are long parallel conductors separated by certain distance. $M$ is the mid-point between them (see the figure). The net magnetic field at $M$ is $B$ . Now, the current $2\,A$ is switched off. The field at $M$ now becomes
An electromagnetic wave radiates outwards from a dipole antenna, with $E _0$​ as the amplitude of its electric field vector. The electric field $B _0$​​ which transports significant energy from the source falls off as: