The decay constant of a radioactive sample

Define decay constant of a radioactive sample. Which of the following radiations, alpha-rays, beta -rays, gamma -rays are easily absorbed by matter?

Define decay constant of a radioactive sample. Which of the following radiations, alpha-rays, beta -rays, gamma -rays travel with greatest speed?

Define decay constant of a radioactive sample. Which of the following radiations, alpha-rays, beta -rays, gamma -rays are similar to X-rays?

Define decay constant of a radioactive sample. Which of the following radiations, alpha-rays, beta -rays, gamma -rays are similar in nature to cathode rays?

Define the term 'decay constant' of a radioactive sample. The disintegration of a given radioactive nucleus is 10000 disintegrations/s and 5,000 disintegration/s after 20 hr and 30 hr respectively from start. Calculate the half life and initial number of nuclei at t = 0 .

Define the term 'decay constant' of a radioactive sample. The of disintergration of a given radioactive nucleus is 10000 disintegrations/s and 5,000 disintegration/s after 20 hr. and 30 hr. respectively from start. Calculate the half life and initial number of nuclei at t = 0.

Decay constant of two radioactive samples is lambda and 3lambda respectively. At t = 0 they have equal number of active nuclei. Calculate when will be the ratio of active nuclei becomes e : 1 .