MCQ
The minimum wavelength of $X-$rays produced by electrons accelerated by a potential difference of volts is equal to
  • A
    $\frac{ eV }{ hc }$
  • B
    $\frac{eh}{cV}$
  • $\frac{hc}{eV}$
  • D
    $\frac{cV}{eh}$

Answer

Correct option: C.
$\frac{hc}{eV}$
$\frac{hc}{eV}$

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

Assertion  :   The lightening conductor at the top of high building has sharp pointed ends.
Reason     : The surface density of charge at sharp points is very high resulting in setting up of electric wind.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
In an ac circuit, current $I=5 \sin \left(100 t-\frac{\pi}{2}\right)$ ampere and altemating potential difference is $V =200$ sin ( 100 t ). The power dissipated in the circuit is :
In a room containing air, heat can go from one place to another:
  1. By conduction only.
  2. By convection only.
  3. By radiation only.
  4. By all the three modes.
Let $n_p$ and $n_e$ be the number of holes and conduction electrons in an intrinsic semiconductor.
When X-rays, Y-rays and microwaves travel in vacuum, their :
Two charges of $+1 μ\text{C} +5 μ\text{C}$ are placed 4cm apart, the ratio of the force exerted by both charges on each other will be-
Magnetic flux $\emptyset ($in weber$)$ linked with a closed circuit of resistance $10$ ohm varies with time $t ($in seconds$)$ as $\emptyset=$ $5 t^2-4 t+1$ The induced electromotive force in the circuit at $t=0.2 \ \mathrm{sec}$. is
An astronaut in a spaceship see the outer space as(a) White (b) Black(c) Blue(d) Red
       
How will two parallel beams of electron behave while moving in the same direction?
Figure represents the graph of photo current $I$ versus applied voltage $(V).$ The maximum energy of the emitted photoelectrons is