The change in wavelength due to scattering in Compton's experiment is termed the Compton shift.

Transitions between discrete atomic energy levels produce atomic spectra, which can be observed in emission or absorption.

The Balmer series of hydrogen corresponds to transitions that emit photons in the visible region of the spectrum.

Holography uses coherent laser light to record and reconstruct three-dimensional images.

Radio waves occupy the longest-wavelength region of the electromagnetic spectrum, larger than infra-red, ultraviolet, or X-rays.

Mercury vapour lamps emit characteristic discrete spectral lines (line emission) specific to mercury atoms.

Intestines and soft tissues give poor contrast on direct X-ray, so they do not cast a good shadow for useful diagnosis without contrast agents.

Bremsstrahlung produces a continuous spectrum from a short-wavelength cutoff (minimum) up to arbitrarily long wavelengths (toward infinite).

Molybdenum is chosen because it has a relatively high melting point and suitable atomic properties for X-ray production.

Infrared radiation generally arises from thermal/vibrational transitions, not inner electron transitions, so statement C is false.