If frequency of $k_{\alpha }$ X-ray emitted from the element with atomic number $31$ is $f,$ then frequency of $k_{\alpha }$ X-ray emitted from the element with atomic number $51$ would be (Assuming screening constant for $k_{\alpha }$ X-rays is $1)$

Q. The frequency of $K_{\alpha }$ $X-$ray emitted from the element with atomic number $31$ is $f$. If the frequency of $K_{\alpha }$ $X-$ray emitted from the element with atomic number $51$ is given by $\frac{25}{x}f$, then the value of $x$ is ________.

$($Assume that the value of screening constant for $K_{\alpha }$ is $1)$

Q. If frequency of $k_{\alpha }$ x - ray emitted from the element with atomic number $31$ is $f$, then frequency of $k_{\alpha }$ x - ray emitted from the element with atomic number $51$ would be (Assuming screening constant for $k_{\alpha }$ x - ray is $1$)

Q. If the frequency of $K_{\alpha }X$-rays emitted from the element with atomic number 31 is v, then the frequency of $K_{\alpha }X$-rays emitted from the element with atomic number 51 would be

Q. An element with atomic number $Z=11$ emits $K_{\alpha }-$X-ray of wavelength $\lambda$. The atomic number which emits $K_{\alpha }-$X-ray of wavelength $4\lambda$ is

Q. An element of atomic number 9 units $K_{\alpha }$ X-ray of wavelength $\lambda$. Find the atomic number of the element which emits $K_{\alpha }$ X-ray of wavelength $4\lambda$.