MCQ
Bragg’s law for $X-$ rays is
- A$d sin$ $\theta = 2n\lambda $
- ✓$2d\,\sin \,\theta = n\lambda $
- C$n\sin \theta = 2\lambda d$
- DNone of these
✓
Answer
Correct option: B.
$2d\,\sin \,\theta = n\lambda $
b
(b) Suppose, and X-ray bean is incident on a solid, making an angle $\theta$ with the planes of the atoms. These $\mathrm{X}$ -rays are diffracted by different atoms and the diffracted rays interfere. In certain directions, the interference is constructive and we obtain strong reflected $X$ -rays. The analysis shows that there will be a strong reflected $x$ -ray beam only if $2 d \sin \theta=n \lambda$
(b) Suppose, and X-ray bean is incident on a solid, making an angle $\theta$ with the planes of the atoms. These $\mathrm{X}$ -rays are diffracted by different atoms and the diffracted rays interfere. In certain directions, the interference is constructive and we obtain strong reflected $X$ -rays. The analysis shows that there will be a strong reflected $x$ -ray beam only if $2 d \sin \theta=n \lambda$
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
Two wires are in unison. If the tension in one of the wires is increased by $2\%, 5$ beats are produced per second. The initial frequency of each wire is .... $Hz$
→The temperature coefficient of resistance for a wire is $0.00125\,^oC$. At $300\,K$ its resistance is $1\, ohm$. The temperature at which the resistance becomes $2\, ohm$ is .......... $K$
→Karman line is a theoretical construct that separates the earth's atmosphere from outer space. It is defined to be the height at which the lift on an aircraft flying at the speed of a polar satellite $(8 \,km / s )$ is equal to its weight. Taking a fighter aircraft of wing area $30 \,m ^2$, and mass $7500 \,kg$, the height of the Karman line above the ground will be in the range .............. $km$ (assume the density of air at height $h$ above ground to be $\rho( h )=1.2 e ^{\frac{ h }{10}} \,kg / m ^3$ where $h$ is in $km$ and the lift force to be $\frac{1}{2} \rho v^2 A$, where $v$ is the speed of the aircraft and $A$ its wing area).
→The relay satellite transmits the television signals continuously from one part of the world to another because its
A ball is thrown vertically up ward. It has a speed of $10\;m/sec$ when it has reached one half of its maximum height. How high ($m$ માં) does the ball rise? (Take $g = 10 \;m/s^2$)
→A small square loop of wire of side $l$ is placed inside a large circular loops of radius $r$. The loop are coplanar and their centre coincide. The mutual inductance of the system is proportional to
→The figure shows a ray incident at an angle $i = \pi /3$. If the plot drawn shown the variation of $| r - i |$ versus $\frac{{{\mu _1}}}{{{\mu _2}}} = k,$ $(r =$ angle of refraction)
→When a current of $2\, A$ flows in a battery from negative to positive terminal, the potential difference across it is $12\, V$. If a current of $3 \,A$ flows in the opposite direction potential difference across the terminals of the battery is $15\, V$, the $emf$ of the battery is ................ $\mathrm{V}$
→One mole of monatomic gas and three moles of diatomic gas are put together in a container. The molar specific heat (in $JK ^{-1} mol ^{-1}$ ) at constant volume is (Let $R=8 \,JK ^{-1} mol ^{-1}$ )
→A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $\overrightarrow E $ and $\overrightarrow B $ represent the electric and magnetic fields respectively, then this region of space may have
→