WBJEE · Physics · Wave Optics
X-rays of wavelength \(\lambda\) gets reflected from parallel planes of atoms in a crystal with spacing \(\mathrm{d}\) between two planes as shown in the figure. If the two reflected beams interfere constructively, then the condition for maxima will be, ( \(\mathrm{n}\) is the order of interference fringe)
- A \(\mathrm{d} \tan \theta=\mathrm{n} \lambda\)
- B \(\mathrm{d} \sin \theta=n \lambda\)
- C \(2 \mathrm{~d} \cos \theta=\mathrm{n} \lambda\)
- D \(2 \mathrm{~d} \sin \theta=\mathrm{n} \lambda\)
Answer & Solution
Correct Answer
(D) \(2 \mathrm{~d} \sin \theta=\mathrm{n} \lambda\)
Step-by-step Solution
Detailed explanation
Hint : \(2 \mathrm{~d} \sin \theta=\mathrm{n} \lambda\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A square conducting loop is placed near an infinitely long current carrying wire with one edge parallel to the wire as shown in the figure. If the current in the straight wire is suddenly halved. which of the following statements will be true? "The loop will .......".
WBJEE 2019 Medium - A charged particle moves with constant velocity in a region where no effect of gravity is felt but an electrostatic field \(\overrightarrow{\mathrm{E}}\)
together with a magnetic field \(\vec{B}\) may be present. Then which of the following cases are possible?WBJEE 2020 Easy - The rms speed of oxygen is \(v\) at a particular temperature. If the temperature is doubled and oxygen molecules dissociate into oxygen atoms, the rms speed becomesWBJEE 2015 Easy
- Three point charges \(q,-2 q\) and \(q\) are placed along \(x\) axis at \(x=-a, 0\) and a respectively. As a \(\rightarrow 0\) and \(q \rightarrow \infty\) while \(q a^2=Q\) remains finite, the clectric field at a point \(P\), at a distance \(x(x \gg a)\) from \(x=0\) is \(E=\frac{\alpha Q}{4 \pi \in_0 x \beta} \hat{i}\). ThenWBJEE 2024 Medium
- If the charge on a capacitor is increased by 2 coulomb, the energy stored in it increases by \(21 \%\). The original charge on the capacitor isWBJEE 2009 Hard
- One mole of an ideal monoatomic gas expands along the polytrope \(PV^3=\) constant from \(V_1\) to \(V_2\) at a constant pressure \(P_1\). The temperature during the process is such that molar specific heat \(C_V=\frac{3 R}{2}\). The total heat absorbed during the process can be expressed asWBJEE 2022 Hard
More PYQs from WBJEE
- Suppose that \(f(x)\) is a differentiable function such that \(f^{\prime}(x)\) is continuous, \(f^{\prime}(0)=1\) and \(f^{\prime \prime}(0)\) does not exist. Let \(g(x)=x f^{\prime}(x) .\) Then,WBJEE 2014 Medium
- If \(\sin 6 \theta+\sin 4 \theta+\sin 2 \theta=0\), then general
value of \(\theta\) isWBJEE 2018 Medium - The general solution of the different equation \(100 \frac{\mathrm{d}^2 \mathrm{y}}{\mathrm{dx}^2}-20 \frac{\mathrm{dy}}{\mathrm{dx}}+\mathrm{y}=0\) isWBJEE 2010 Hard
- For what value of ' \(a\) ', the sum of the squares of the roots of the equation \(x^2-(a-2) x-a+1=0\) will have the least value?WBJEE 2025 Medium
- In the equilibrium, \(\mathrm{H}_{2}+\mathrm{I}_{2} \rightleftharpoons 2 \mathrm{HI},\) if at a given temperature the concentrations of the reactants are increased, the value of the cquilibrium constant, \(K_{C}\), willWBJEE 2019 Easy
- \[
\begin{aligned}
&\text { The decreasing order of basic character of }\\
&\mathrm{K}_{2} \mathrm{O}, \mathrm{BaO}, \mathrm{CaO} \text { and } \mathrm{MgO} \text { is }
\end{aligned}
\]WBJEE 2015 Easy