What do rabbit tree and fungus have in common

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

What is the average rate of the reaction between 10 and 20 s?