The correct answer is B. 1 angstrom.
X-rays are a type of electromagnetic radiation with wavelengths in the range of 0.01 to 10 nanometers, or 10 to 1000 angstroms. This is shorter than the wavelength of visible light, but longer than the wavelength of gamma rays.
X-rays are produced when high-energy electrons are stopped by a material. The energy of the electrons is converted into X-rays, with the wavelength of the X-rays depending on the energy of the electrons.
X-rays are used in a variety of medical and industrial applications, including medical imaging, radiography, and crystallography.
Option A is incorrect because 10 microns is 10,000 angstroms. This is too long for the wavelength of X-rays.
Option C is incorrect because 1 cm is 100,000 angstroms. This is too long for the wavelength of X-rays.
Option D is incorrect because 1 m is 1,000,000 angstroms. This is too long for the wavelength of X-rays.