Moseley’s Law

The Bragg’s equation $2d\sin \theta =n\lambda$ has no solution for

The element which has a $K_{\alpha }$ $x$-rays line of wavelength $1.8\mathrm{\AA }$ is $\left(R=1.1\times {10}^7 {\mathrm{m}}^{-1}, b=1\right)$ and $\left.\sqrt{\frac{5}{33}}=0.39\right)$

If $\mathrm{Ni}$ (nical) is used as target material, then ${\lambda }_{\min }$ is minimum wavelength produced in $X$-ray tube and ${\lambda }_{k\alpha }$ is the wavelength of $k_{\alpha }$ line. If the operating tube voltage is increased and $Ca$ (calsium) is used as target material in place of $Ni,$ then the difference $\left|{\lambda }_{k\alpha }-{\lambda }_{\min }\right|$ will :

A student is jogging on a straight path with the speed $5.4 \mathrm{km}$ per hour. Perpendicular to the path is kept a pipe with its opening $8 \mathrm{m}$ from the road (see figure). Diameter of the pipe is $0.45 \mathrm{m}$ At the other end of the pipe is a speaker emitting sound of $1280 \mathrm{Hz}$ towards the opening of the pipes. As the student passes in front of the pipe, she hears the speaker sound for $T$ seconds. $T$ is in the range (take speed of sound, $320 {\mathrm{ms}}^{-1}$):

The wavelength of $K_{\alpha }$ line from an element of atomic number $51$ is $\lambda$. From another element the wavelength of $K_{\alpha }$ line is $4\lambda$. What is the atomic number of second element?
 

The wavelength of $K_{\alpha }$-line characteristic X-rays e mitted by an element is 0.32 Å. The wavelength of $K_{\beta }$-line emitted by the same element will be :-

A X-ray tube operates at potential 15 kV. Find the minimum wavelength of X-ray.

In an X-ray tube accelerating potential is $60 \mathrm{kV}$. What is the maximum frequency of emitted X-ray ?

In Coolige tube the relation between used voltage V and minimum wavelength ${\lambda }_{min}$ is-
 

When electron is incident on molyblednum then by changing energy of electron :-

If vacuum tube is operated at $6.4 \mathrm{kV}$, what is the wavelength of X-ray produced :-
 

The order of energy of X-ray photon is :-

${\lambda }_{min}$ of X-rays depends on :-

Lattice constant of a crystal is$3 \times {10}^{–8} \mathrm{cm}$ and glance angle of X-ray is $30°$ for first order diffraction, then the value of $\mathrm{\lambda }$ will be :-

For X-ray diffraction, order of size of obstacle is:

To increase the hardness of X-rays in coolidge tube we should :-

What is the minimum wavelength of X-rays :-

$20 \mathrm{kV}$ Potential is applied across X-ray tube, the minimum wavelength of X-ray emitted will be :-

$5000 \mathrm{V}$is applied on an electronic X-ray tube. Then minimum wavelength of X-ray will be :-

If minimum wavelength obtained in a X-ray tube is $2.5 \mathrm{x} {10}^{–10} \mathrm{m}$. For this minimum wavelength the minimum operating voltage of the tube should be-