Which type of waves are known as ionizing radiation?

Which type of waves are known as ionizing radiation?

• A. Ionizing radiation
• B. Ultraviolet light
• C. High frequency, from ultraviolet and beyond
• D. Radio waves

Answer: (C)

Ionizing radiation refers to waves whose photons have enough energy to knock electrons loose from atoms. The energy of a photon is E = hν, so when the frequency is high enough that hv meets or exceeds an atom’s ionization energy, the radiation can ionize matter. That criterion puts the high-frequency end of the spectrum—starting with ultraviolet and continuing through X-rays and gamma rays—into the ionizing category. Lower-frequency waves, like radio waves, carry too little energy per photon to ionize under normal conditions, and much of the visible spectrum is also non-ionizing. So the best description is high-frequency radiation, from ultraviolet and beyond, as ionizing radiation.

Ionizing radiation refers to waves whose photons have enough energy to knock electrons loose from atoms. The energy of a photon is E = hν, so when the frequency is high enough that hv meets or exceeds an atom’s ionization energy, the radiation can ionize matter. That criterion puts the high-frequency end of the spectrum—starting with ultraviolet and continuing through X-rays and gamma rays—into the ionizing category. Lower-frequency waves, like radio waves, carry too little energy per photon to ionize under normal conditions, and much of the visible spectrum is also non-ionizing. So the best description is high-frequency radiation, from ultraviolet and beyond, as ionizing radiation.