147589 A radioactive nucleus can decay in two different processes with half life $0.7 \mathrm{hr}$ and 0.3 hr.
The effective average life of the nucleus in minutes approximately is
(value of $\ln 2=0.7$ )

147590 An alloy is composed of two radioactive materials $A$ and $B$ having equal weight. The half life of $A$ and $B$ are 10 yrs and 20 yrs respectively. After time t, the alloy was found to consist of $\left(\frac{1}{\mathrm{e}}\right) \mathrm{kg}$ of $A$ and $1 \mathrm{~kg}$ of $B$. If the atomic weight of $A$ and $B$ are same, then the value of $t$ is (Assume, $\ln 2=0.7$ )

147591 The half life of neutron is 693 seconds. What fraction of neutrons will decay when a beam of neutrons, having kinetic energy of $0.084 \mathrm{eV}$, travels a distance of $1 \mathrm{~km}$ ?
(mass of neutron $=1.68 \times 10^{-27} \mathrm{~kg}$, and In $2=$ 0.693)

147593 Two radioactive nuclei ' $x$ ' and ' $y$ ' initially contain equal number of atoms. Their half-life periods are 1 hour and 2 hours respectively. The ratio of their rate of disintegration after 2 hours from the start is

147589 A radioactive nucleus can decay in two different processes with half life $0.7 \mathrm{hr}$ and 0.3 hr.
The effective average life of the nucleus in minutes approximately is
(value of $\ln 2=0.7$ )

147590 An alloy is composed of two radioactive materials $A$ and $B$ having equal weight. The half life of $A$ and $B$ are 10 yrs and 20 yrs respectively. After time t, the alloy was found to consist of $\left(\frac{1}{\mathrm{e}}\right) \mathrm{kg}$ of $A$ and $1 \mathrm{~kg}$ of $B$. If the atomic weight of $A$ and $B$ are same, then the value of $t$ is (Assume, $\ln 2=0.7$ )

147591 The half life of neutron is 693 seconds. What fraction of neutrons will decay when a beam of neutrons, having kinetic energy of $0.084 \mathrm{eV}$, travels a distance of $1 \mathrm{~km}$ ?
(mass of neutron $=1.68 \times 10^{-27} \mathrm{~kg}$, and In $2=$ 0.693)

147593 Two radioactive nuclei ' $x$ ' and ' $y$ ' initially contain equal number of atoms. Their half-life periods are 1 hour and 2 hours respectively. The ratio of their rate of disintegration after 2 hours from the start is

147589 A radioactive nucleus can decay in two different processes with half life $0.7 \mathrm{hr}$ and 0.3 hr.
The effective average life of the nucleus in minutes approximately is
(value of $\ln 2=0.7$ )

147590 An alloy is composed of two radioactive materials $A$ and $B$ having equal weight. The half life of $A$ and $B$ are 10 yrs and 20 yrs respectively. After time t, the alloy was found to consist of $\left(\frac{1}{\mathrm{e}}\right) \mathrm{kg}$ of $A$ and $1 \mathrm{~kg}$ of $B$. If the atomic weight of $A$ and $B$ are same, then the value of $t$ is (Assume, $\ln 2=0.7$ )

147591 The half life of neutron is 693 seconds. What fraction of neutrons will decay when a beam of neutrons, having kinetic energy of $0.084 \mathrm{eV}$, travels a distance of $1 \mathrm{~km}$ ?
(mass of neutron $=1.68 \times 10^{-27} \mathrm{~kg}$, and In $2=$ 0.693)

147593 Two radioactive nuclei ' $x$ ' and ' $y$ ' initially contain equal number of atoms. Their half-life periods are 1 hour and 2 hours respectively. The ratio of their rate of disintegration after 2 hours from the start is

147589 A radioactive nucleus can decay in two different processes with half life $0.7 \mathrm{hr}$ and 0.3 hr.
The effective average life of the nucleus in minutes approximately is
(value of $\ln 2=0.7$ )

147590 An alloy is composed of two radioactive materials $A$ and $B$ having equal weight. The half life of $A$ and $B$ are 10 yrs and 20 yrs respectively. After time t, the alloy was found to consist of $\left(\frac{1}{\mathrm{e}}\right) \mathrm{kg}$ of $A$ and $1 \mathrm{~kg}$ of $B$. If the atomic weight of $A$ and $B$ are same, then the value of $t$ is (Assume, $\ln 2=0.7$ )

147591 The half life of neutron is 693 seconds. What fraction of neutrons will decay when a beam of neutrons, having kinetic energy of $0.084 \mathrm{eV}$, travels a distance of $1 \mathrm{~km}$ ?
(mass of neutron $=1.68 \times 10^{-27} \mathrm{~kg}$, and In $2=$ 0.693)

147593 Two radioactive nuclei ' $x$ ' and ' $y$ ' initially contain equal number of atoms. Their half-life periods are 1 hour and 2 hours respectively. The ratio of their rate of disintegration after 2 hours from the start is