MCQ
Which of the following is true for photon
- ✓$E = \frac{{hc}}{\lambda }$
- B$E = \frac{1}{2}m{u^2}$
- C$p = \frac{E}{{2v}}$
- D$E = \frac{1}{2}m{c^2}$
✓
Answer
Correct option: A.
$E = \frac{{hc}}{\lambda }$
a
For photon,
For photon,
$E =\frac{ hc }{\lambda} \text {. }$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
An electron (mass = $9.0 × $${10^{ - 31}}$ $kg$ and charge =$1.6 \times {10^{ - 19}}$ $coulomb$) is moving in a circular orbit in a magnetic field of $1.0 \times {10^{ - 4}}\,weber/{m^2}.$ Its period of revolution is
→Fundamental frequency of pipe is $100 Hz$ and other two frequencies are $300 Hz$ and $500 Hz$ then
→Two identical charged particles enter a uniform magnetic field with same speed but at angles $30^o$ and $60^o$ with field. Let $a, b$ and $c$ be the ratio of their time periods, radii and pitches of the helical paths than
→Two balls of same size but the density of one is greater than that of the other are dropped from the same height, then which ball will reach the earth first (air resistance is negligible)
A loop, made of straight edges has four corners at $A (L, L, O)$, $B(-L, L, O)$, $C(-L, -L, O)$, $D(L, -L, O)$. A magnetic field $\vec B = {B_0}\left( {\hat i + \hat k} \right)T$ is present in the region. The magnetic flux passing through the loop $ABCD$ is
→As shown in the figure,$P$ and $Q$ are two coaxial conducting loops separated by some distance. When the switch $S$ is closed, a clockwise current ${I_P}$ flows in $P$ (as seen by $E$) and an induced current ${I_{{Q_1}}}$ flows in $Q.$ The switch remains closed for a long time. When $S$ is opened, a current ${I_{{Q_2}}}$ flows in $Q$. Then the directions of ${I_{{Q_1}}}$ and ${I_{{Q_2}}}$ (as seen by $E$) are
→According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal versus the frequency, of the incident radiation gives a straight line whose slope
If the equation for the displacement of a particle moving on a circular path is given as
→$\theta = 2{t^3} + 0.5,$
where $\theta $ is in radians and $t$ is in second. Then the angular velocity of the particle after two second will be ....... $rad/sec$
The monoenergetic beam of electrons moving along $+ y$ direction enters a region of uniform electric and magnetic fields. If the beam goes straight undeflected, then fields $B$ and $E$ are directed respectively along
→A square wave of the modulating signal is shown in the figure. The carrier wave is given by $C ( t )=5 \sin (8 \pi t )$ Volt. The modulation index is.
→