Physics - EM Waves Question with Solution | TestHub

(A) A Klystron valve or the magnetron valve are generally used for the production of electromagnetic waves and that electromagnetic wave is Microwave. So, $\left(A\right)\to IV$.

(B) Gamma rays are produced during the disintegration of radioactive atomic nuclei and the decay of certain subatomic particles.So, $\left(B\right)\to I$

(C) Radio waves can be produced by rapid acceleration and deceleration of electrons in aerials (conductors). These can be detected by receivers of aerials. So, $\left(C\right)\to II$

(D) X-rays are produced when a metal target or any other element is bombarded with high energy particles such as electrons, photons or ions. When high energy electrons is incident on a bound electron in an atom, then bound electron emits from the inner shell of that atom. So, $\left(D\right)\to III$