MCQ
If $V$ be the accelerating voltage, then the maximum frequency of continuous $X-$ rays is given by
- A$\frac{{eh}}{V}$
- B$\frac{{hV}}{e}$
- ✓$\frac{{eV}}{h}$
- D$\frac{h}{{eV}}$
✓
Answer
Correct option: C.
$\frac{{eV}}{h}$
c
(c) $E = eV = h{\nu _{\max }}\, \Rightarrow \,{\nu _{\max }} = \frac{{eV}}{h}$
(c) $E = eV = h{\nu _{\max }}\, \Rightarrow \,{\nu _{\max }} = \frac{{eV}}{h}$
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
$A$ man of height $‘h’$ is walking away from $a$ street lamp with $a$ constant speed $‘v’$. The height of the street lamp is $3h$. The rate at which of the length of the man’s shadow is increasing when he is at a distance $10h$ from the base of the street lamp is :
→A block of mass $m$ is placed on a smooth horizontal surface. A force making an angle $\theta$ with the horizontal starts acting on the block. The magnitude of the force is constant but its direction with the horizontal changes as $\theta = a+ bs$, where $a$ and $b$ are constants and $s$ is the distance covered by the block. If $|F| = 2mb$, find the velocity of the block as function of the angle $\theta$ .
→The bob $A$ of a simple pendulum is released when the string makes an angle of ${45^o}$with the vertical. It hits another bob $B$ of the same material and same mass kept at rest on the table. If the collision is elastic
→The ratio of de-Broglie wavelength of an $\alpha$-particle and a proton accelerated from rest by the same potential is $\frac{1}{\sqrt{ m }}$, the value of $m$ is $........$
→The mean kinetic energy of a gas at $300\, K$ is $100\, J.$ The mean energy of the gas at $450\, K$ is equal to ...... $J$
→Only $2 \%$ of the optical source frequency is the available channel bandwidth for an optical communicating system operating at $1000 \,nm$. If an audio signal requires a bandwidth of $8 \,kHz$, how many channels can be accommodated for transmission
→Given below are two statements:
→Statement $(I)$ : When currents vary with time, Newton's third law is valid only if momentum carried by the electromagnetic field is taken into account.
Statement $(II)$ : Ampere's circuital law does not depend on Biot-Savart's law.
In the light of the above statements, choose the correct answer from the options given below:
$Assertion$ : Use of ball bearings between two moving parts of a machine is a common practice.
$Reason$ : Ball bearings reduce vibrations and provide good stability.
→$Reason$ : Ball bearings reduce vibrations and provide good stability.
An ideal gas is taken through the cycle $A \to B \to C \to A$ , as shown in the figure. If the net heat supplied to the gas in the cycle is $5\ J$, the work done by the gas in the process $C \to A$ is .... $J$
→There are two metallic spheres of same radii but one is solid and the other is hollow, then