Physics - Modern Physics Question with Solution | TestHub

If${\mathrm{\lambda }}_{\mathrm{c}\mathrm{u}}$is the wavelength of${\mathrm{K}}_{\mathrm{\alpha }}$X-ray line of copper (atomic number 29) and${\mathrm{\lambda }}_{\mathrm{M}\mathrm{o}}$is the wavelength of the${\mathrm{K}}_{\mathrm{\alpha }}$X-ray line of molybdenum (atomic number 42), then the ratio$\frac{{\mathrm{\lambda }}_{\mathrm{c}\mathrm{u}}}{{\mathrm{\lambda }}_{\mathrm{M}\mathrm{o}}}$is close to