If `20 gm` of a radioactive substance due to radioactive decay reduces to `10 gm` in `4` minutes, then in what time `80 gm` of the same substance will reduce to `10 gm` ?

Match the statements given in column-I with their corresponding possible results in column-II. {:(,"Column-I",,"Column-II",),((P)," If photons of ultraviolet light of energy 12 eV are incident on a metal surface of work function of 4 eV, then the stopping potential (in eV) will be ",,(1),8),((Q),"The ratio of wavelengths of "K_(alpha)" lines of two elements is "(85/81)^(2)" Number of elements having atomic number between these elements will be ",,(2),3),((R)," If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time (in minutes) 80 gm of the same substance will reduce to 20 gm",,(3),8),((S),"The mass defect for the nucleus of helium is 0.0302a.m.u. The binding energy per nucleon for helium in MeV is approximately" (1am u = 930 MeV//c^2),,(4),7):}

Match the statements given in column-I with their corresponding possible results in column-II. {:(,"Column-I",,"Column-II",),((P)," If photons of ultraviolet light of energy 12 eV are incident on a metal surface of work function of 4 eV, then the stopping potential (in eV) will be ",,(1),8),((Q),"The ratio of wavelengths of "K_(alpha)" lines of two elements is "(85/81)^(2)" Number of elements having atomic number between these elements will be ",,(2),3),((R)," If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time (in minutes) 80 gm of the same substance will reduce to 20 gm",,(2),1),((S),"The mass defect for the nucleus of helium is 0.0302a.m.u. The binding energy per nucleon for helium in MeV is approximately" (1am u = 930 MeV//c^2),,(4),7):}

The half life of a 1st order reaction 4 min. In what time 16 gm of the reactant will be reduced to 1 gm?

The half - life of a radioactive substance is 30minutes . The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is:

The half-life of a radioactive substance against alpha- decay is 1.2 xx 10^7 s . What is the decay rate for 4 xx 10^15 atoms of the substance ?

The half-life of a radioactive substance against alpha- decay is 1.2 xx 10^7 s . What is the decay rate for 4 xx 10^15 atoms of the substance ?

The half-life of a radioactive substance against alpha- decay is 1.2 xx 10^7 s . What is the decay rate for 4 xx 10^15 atoms of the substance ?

1 gm equivalent of a substance is the weight of the substance which is equivalent to