Match column I statement with the right option of column II Column I \( \begin{array}{ll}\text {...

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Match column I statement with the right option of column II
Column I
\( \begin{array}{ll}\text { (a) The phenomenon of emission of electron from the } & \text { (P) Photoelectric emission. } \\ \text { metal surface on heating is called. } & \text { (Q) Secondary emission. } \\ \text { (b) The phenomenon of emission of electron from } & \text { (R) Thermionic emission. } \\ \text { the metal when radiation of suitable frequency } & \end{array} \)
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