The heaviest nuclear radiation is :

1. X radiation
2. α radiation
3. γ radiation
4. β radiation

To study the age of excavated materials of archeological significance, we study the rate of decay of an isotope of :

1. uranium
2. cobalt
3. carbon
4. chlorine

The speed of γ radiations is :

1. of the order of 10⁶ ms^-1
2. of the order of 10⁷ ms^-1
3. equal to the speed of light, i.e. 3 x 10⁸ ms^-1
4. none of the above

The correct representation of γ emission is :

1. $_{Z}^{A}\text{P} \longrightarrow \space _{Z-1}^{ \space \space \space \space \space A}\text{Q} + γ$
2. $_{Z}^{A}\text{P} \longrightarrow \space _{Z-2}^{A-4}\text{Q} + \space _{2}^{4}γ$
3. $_{Z}^{A}\text{P} \longrightarrow \space _{Z}^{A}\text{P} + γ$
4. $_{Z}^{A}\text{P} \longrightarrow \space _{Z-1}^{A}\text{P} + γ$