Typical X-ray wavelengths are on the order of 10^-10 meters (angstrom scale).

The block states C; thermal radiation, ultraviolet, and light rays are all part of the electromagnetic spectrum.

For the same power, photon rate = power / photon energy; red photons have lower energy than violet, so the red laser emits more photons per second.

Glow worms produce light through biochemical reactions in their bodies, i.e., bioluminescence, not by reflecting or fluorescing external light.

High-frequency radio waves used to carry information are commonly referred to as carrier waves.

Light is an electromagnetic wave with oscillations perpendicular to the direction of propagation, i.e., transverse.

The maximum speed of light occurs in vacuum; it is reduced in materials like glass, plastics, or air.

Decrease in wavelength (blue shift) implies the star is moving toward Earth; Δλ/λ ≈ v/c = 0.0005 gives v ≈ 1.5 × 10^5 m/s, so option B.

Characteristic X-rays arise when an inner-shell electron is removed and an outer-shell electron drops into the vacancy, emitting X-rays.

For photons λ ∝ 1/E, while for non-relativistic particles de Broglie λ ∝ 1/√E, hence option B is correct.