80% of the radioactive nuclei are left undecayed in one day then % of nuclei left undecayed after two days will be:

80% of the radioactive nuclei present in a sample is found to remain undecayed after one day. The percentage of undecayed nuclei left after two days will be a. 64 b. 20 c. 46 d. 80

80% of the radioactive nuclei present in a sample is found to remain undecayed after one day. The percentage of undecayed nuclei left after two days will be a. 64 b. 20 c. 46 d. 80

At a given instant, 60% of the radioactive nuclei in a sample are left undecayed. After 20 s, 85% nuclei have disintegrated , mean life of nuclei

At a given instant, 60% of the radioactive nuclei in a sample are left undecayed. After 20 s, 85% nuclei have disintegrated , mean life of nuclei

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

A radioactive sample is decayed 20% in one day. After next two days, the undecayed percentage of nuclei will be

A radioactive sample is decayed 20% in one day. After next two days, the undecayed percentage of nuclei will be