Question

An unknown element emits ?? X rays of 0.1940 nm.

a) What is the element?

b) What wavelength is this element’s ?? X ray?

Answer 1

Answer 2

Unfortunately, the question is incomplete as the symbol for the unknown element's X-ray emission is missing. However, I can provide some general information about X-ray emission and how it is used to identify elements.

X-rays are a form of electromagnetic radiation that have wavelengths shorter than visible light. When an atom is bombarded with high-energy electrons or other particles, it can emit X-rays as the electrons in the atom transition to lower energy levels. Each element emits X-rays at specific wavelengths, which can be used to identify the element.

The wavelength of an X-ray emission is related to the energy of the emitted photons, which is determined by the energy difference between the atomic energy levels involved in the transition. The relationship between wavelength (λ) and energy (E) for electromagnetic radiation is given by the equation E = hc/λ, where h is Planck's constant and c is the speed of light.

To identify the element emitting a particular X-ray wavelength, the wavelength of the emission must be compared to known values for the X-ray emissions of all elements. This is typically done using X-ray spectroscopy, which involves analyzing the X-rays emitted by a sample of the element and identifying the characteristic X-ray emissions.

So, to answer your question, more information is needed about the symbol for the unknown element's X-ray emission in order to determine the element and its X-ray wavelength.