A radioative substance decays 10% in 5 days. The aamount remains after 20 days is [log 3 =0.4771]

If the quantify of radioactive material reduces by 10% in 5days then the quantity that remains after 20 days will be -

If 20% of a radioactive sample decays in 10 days, then the amount of substance left after 20 days will be approximately

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately.

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately.

50% of a radio active substance decays in 5 hours. The time required for the 87.5% decays is

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

A radioactive substance decay to 1/5 of its original value in 56 days. The decay constant is