MCQ
In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be ($\lambda$ $=6000 Å$ )
  • A
    Zero
  • B
    $2\pi $
  • C
    $4\pi $
  • $6\pi $

Answer

Correct option: D.
$6\pi $
d
(d)$\because n = 3,\;\;\therefore 2n\pi  = 2 \times 3\pi  = 6\pi $

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

An unknown nucleus collides with a ${}^4He$ nucleus, and after the collision the two nuclei travel in perpendicular directions relative to each other. If kinetic energy is lost in the collision, the unknown nucleus must be 
Assertion: ${}_Z{X^A}$ undergoes a $2\alpha  -$ decays, $2\beta  -$ decays and $2\gamma  - $ decays and the daughter product is ${}_{Z - 2}{X^{A - 8}}$

Reason : In $\alpha  - $decays the mass number decreases by $4$ and atomic number decreases by $2$. In $2\beta  - $ decays the mass number remains unchanged, but atomic number increases by $1$ only.

A body of mass $4 \ kg$ experiences two forces $\overrightarrow{ F }_1=5 \hat{ i }+8 \hat{ j }+7 \hat{ k }$ and $\overrightarrow{ F }_2=3 \hat{ i }-4 \hat{ j }-3 \hat{ k }$. The acceleration acting on the body is $:$
If an electron oscillates at a frequency of $ 1 GHz$  it gives
What is the value of linear velocity, if $\vec \omega = 3\hat i - 4\hat j + \hat k$ and $\vec r = 5\hat i - 6\hat j + 6\hat k$
White light is passed through a prism whose angle is $5^o $. If the refractive indices for rays of red and blue colour are respectively $1.64$ and $1.66,$ the angle of deviation between the two colours will be.....$^o$
A current of $2\, amp$. flows in a long, straight wire of radius $2\, mm$. The intensity of magnetic field on the axis of the wire is
Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is $0.7\; \mathrm{V} .$ For the input voltages shown in the figure, the voltage (in $Volts$) at point $A$ is
An elevator weighing $6000\,kg$ is pulled upward by a cable with an acceleration of $5\,ms^{-2}$. Taking $g$ to be $10\,ms^{-2}$. Then the tension in the cable is ............ $N$
The potential energy of a particle varies with distance $x$ from a fixed origin as $U=\frac{A \sqrt{x}}{x^2+B}$, where $A$ and $B$ are dimensional constants then dimensional formula for $A B$ is