Question
The width of the $nth$ $HPZ$ will be
✓
Answer
(b)Width of $nth$ $HPZ$ ${B_n} = {r_n} - {r_{n - 1}}$
${r_n} = \sqrt {nb\lambda } $, ${r_{n - 1}} = \sqrt {(n - 1)b\lambda } $
${B_n} = \sqrt {nb\lambda } - \sqrt {(n - 1)b\lambda } = \sqrt {b\lambda } \,[\sqrt n - \sqrt {(n - 1)} ]$
${r_n} = \sqrt {nb\lambda } $, ${r_{n - 1}} = \sqrt {(n - 1)b\lambda } $
${B_n} = \sqrt {nb\lambda } - \sqrt {(n - 1)b\lambda } = \sqrt {b\lambda } \,[\sqrt n - \sqrt {(n - 1)} ]$
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 conductor $ABOCD$ moves along its bisector with a velocity of $1\, m/s$ through a perpendicular magnetic field of $1$ $wb/m^2$, as shown in fig. If all the four sides are of $1\,m$ length each, then the induced emf between points $A$ and $D$ is......$volt$
→A small lamp is hung at a height of $ 8$ feet above the centre of a round table of diameter $16 $ feet. The ratio of intensities of illumination at the centre and at points on the circumference of the table will be
→Optical fibres are related with
The minimum distance between an object and its real image formed by a convex lens is
With what velocity a ball be projected vertically so that the distance covered by it in $5^{th}$ second is twice the distance it covers in its $6^{th}$ second.........$m/s$ $(g = 10\,m/{s^2})$
→$Assertion$ : A tennis ball bounces higher on hills than in plains.
$Reason$ : Acceleration due to gravity on the hill is greater than that on the surface of earth
→$Reason$ : Acceleration due to gravity on the hill is greater than that on the surface of earth
The graph between number of decayed atoms $N'$ of a radioactive element and time $t$ is
→If $R$ is the radius of the earth and $g$ the acceleration due to gravity on the earth's surface, the mean density of the earth is
→The potential difference between the plates of a parallel plate capacitor is changing at the rate of $10^6\, V/s$. If the capacitance is $2\,\mu F$, the displacement current in the dielectric of the capacitor will be......$A$
→Wein's constant is $2892 \times {10^{ - 6}}$$MKS$ unit and the value of ${\lambda _m}$ from moon is $14.46$ microns. What is the surface temperature of moon ...... $K$
→