A certain element emits `K_alpha` X-ray of energy 3*69 keV. Use the data from the previous problem to identify the element.

Iron emits K_alpha X-ray of energy 6.4 keV and Calcium emits K_alpha X-ray of energy 3.69 keV. Calculate the times taken by an iron K_a photon and a calcium K_a photon to cross through a distance of 3 km.

Iron emits K_alpha X-ray of energy 6.4 keV and Calcium emits K_alpha X-ray of energy 3.69 keV. Calculate the times taken by an iron K_a photon and a calcium K_a photon to cross through a distance of 3 km.

Iron emits K_alpha X-ray of energy 6.4 keV and Calcium emits K_alpha X-ray of energy 3.69 keV. Calculate the times taken by an iron K_a photon and a calcium K_a photon to cross through a distance of 3 km.

An element of atomic number 9 emits K_(alpha) X-ray of wavelength lamda . Find the atomic number of the element which emits K_(alpha) X-ray of wavelength 4lamda .

An element of atomic number 9 emits K_(alpha) X-ray of wavelength lamda . Find the atomic number of the element which emits K_(alpha) X-ray of wavelength 4lamda .

A free atom of iron emits K_alpha X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of and iron atom = 9.3 xx 10 ^(-26) kg .

A free atom of iron emits K_alpha X-rays of energy 6*4 keV. Calculate the recoil kinetic energy of the atom. Mass of and iron atom = 9*3 xx 10 ^(-26) kg .