X-rays generally have energy and a frequency.
a. low; low
b. low; high
c. high; low
d. high; high

D

X-rays generally have high energy and a high frequency.

Explanation:

High-energy X-rays or HEX-rays are very hard X-rays, with typical energies of 80–1000  keV (1 MeV), about one order of magnitude higher than conventional X-rays (and well into gamma-ray energies over 120 keV).

Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies. Likewise, red light has a longer wavelength than blue light. We can also think of light as consisting of particles or packets on information that we call photons.

wavelegth as in spectrum red oygbiv

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.