One microgram of radioactie sodium `Na^(24)` with a half life of 15 h was injected fin to a living system for a bio assay .How long will iot take for the radioactivity to fall to 25% of the initial value?

One microgram of radioactive sodium, ""_(11)^(24)Na with half life of 15 hour was injected into a living system. How long will it take for the radioactivity to fall to 25% of the initial value ?

A radioactive isotope has a half-life of T years. How long will it take for the activity to reduce to 3.125% of its original value?

One mu g of a radioactive iodine contained in thyroxine is injected into the blood of a patient. How long will it take for radioactivity to fall to 50%, 25% and 10% of the initial value? ( t_(1//2) for ._(53)^(131)I = 8.052 days)

A radioactive isotope has a half-life of 10 years. How long will it take for the activity to reduce to 3.125% ?

A radio active isotope has a half-life of T years. How long will it take the activity to reduce to 1% of its original value ?

A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to - 1% of its original value?

A radioactive isotope has a half life of T years : How long will it take the activity to reduce to 1%of its original value?