Question

Which of the following statements is/are true for non-ionising radiations?

• A. They have longer wavelength than ionising radiations
• B. Have ionising capacity
• C. Can only excite atoms from a lower energy to a higher energy level
• D. They cause the formation of charged ions

Answer 1

Answer: (A), (C)

The correct options are
A They have longer wavelength than ionising radiations
C Can only excite atoms from a lower energy to a higher energy level

Non-ionising radiations form a part of the electromagnetic spectrum that have enough energy to cause excitation of electrons to a higher energy level. They have wavelengths longer than ionising radiations and hence, lesser energy. Ionising radiations can remove electrons completely from an atom and cause formation of ions.