Physics-
General
Easy
Question
If t1/2 is the half life of a substance then t3/4 is the time in which substance
- Decays
- Remains
- Decays
- Remains
The correct answer is: Decays
You must remember that t1/2 is time in which substance decays half. Hence in t3/4 time substance decays
Related Questions to study
Physics-
The figure shows a graph between and ln|n|, where is the area enclosed by the nth orbit in a hydrogen like atom. The correct curve is
The figure shows a graph between and ln|n|, where is the area enclosed by the nth orbit in a hydrogen like atom. The correct curve is
Physics-General
Physics-
The graph between log R and log A where R is the nuclear radius and A is the mass number is
The graph between log R and log A where R is the nuclear radius and A is the mass number is
Physics-General
Physics-
The graph which represents the correct variation of logarithm of activity (log (A) versus time, in figure is
The graph which represents the correct variation of logarithm of activity (log (A) versus time, in figure is
Physics-General
Physics-
In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
Physics-General
Physics-
Binding energy per nucleon verses mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. The process that would release energy is
Binding energy per nucleon verses mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. The process that would release energy is
Physics-General
Physics-
The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
Physics-General
Physics-
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
Physics-General
Physics-
Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct
Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct
Physics-General
Physics-
The first excited state of hydrogen atom is 10.2 eV above its ground state. The temperature is needed to excite hydrogen atoms to first excited level, is
The first excited state of hydrogen atom is 10.2 eV above its ground state. The temperature is needed to excite hydrogen atoms to first excited level, is
Physics-General
Physics-
Two radioactive materials and have decay constants and respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of to that of will be 1/e after a time
Two radioactive materials and have decay constants and respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of to that of will be 1/e after a time
Physics-General
Physics-
The half life of radium is 1620 years and its atomic weight is 226 kgm per kilomol. The number of atoms that will decay from its 1 gm sample per second will be
The half life of radium is 1620 years and its atomic weight is 226 kgm per kilomol. The number of atoms that will decay from its 1 gm sample per second will be
Physics-General
Physics-
The half life of radioactive Radon is 3.8 days. The time at the end of which of the Radon sample will remain undecayed is (Given)
The half life of radioactive Radon is 3.8 days. The time at the end of which of the Radon sample will remain undecayed is (Given)
Physics-General
Physics-
The electric potential between a proton and an electron is given by where is a constant. Assuming Bohr’s model to be applicable, write variation of with n, n being the principal quantum number
The electric potential between a proton and an electron is given by where is a constant. Assuming Bohr’s model to be applicable, write variation of with n, n being the principal quantum number
Physics-General
Physics-
A neutron with velocity V strikes a stationary deuterium atom, its kinetic energy changes by a factor of
A neutron with velocity V strikes a stationary deuterium atom, its kinetic energy changes by a factor of
Physics-General
Physics-
In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy and the radius of the first orbit will be (is the Bohr radius)
In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy and the radius of the first orbit will be (is the Bohr radius)
Physics-General