Question

1. (_{90}^{234}th

ightarrow_{91}^{234}pa + _{-1}^{0}e) which type of nuclear radiation is being emitted here? a) beta b) gamma c) none d) alpha 19. has the highest penetrating power. can penetrate our body. even several cm thick of lead or several meters thick of concrete cannot stop all of it. a) beta b) gamma c) alpha

Explanation:

Step1: Identify radiation in 18

Beta - decay emits an electron ($_{-1}^0e$). In the reaction $_{90}^{234}Th
ightarrow_{91}^{234}Pa + _{-1}^0e$, an electron is emitted, so it's beta - radiation.

Step2: Identify radiation in 19

Gamma - rays have the highest penetrating power among alpha, beta, and gamma radiations. They can penetrate the human body and are difficult to stop with lead or concrete, so the answer is gamma.

Answer:

1. a) beta
2. b) Gamma