Related Questions

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
A man sells chocolates which are in the boxes. Only either full box or half a box of chocolates can be purchased from him. A customer comes and buys half the number of boxes which the seller had plus half box more. A second customer comes and purchases half the remaining number of boxes plus half a box. After this the seller is left with no chocolate boxes. How many chocolate boxes the seller had initially?
A 2
B 3
C 4
D 3.5
E None of these
The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is
A 0.875
B 0.5
C 0.425
D Data insufficient to calculate
The half life period of a first order reaction is given by (where, K = rate constant. )
A 1.5 K
B 2.5 K
C $$\frac{{0.693}}{{\text{K}}}$$
D 6.93 K
Half life period of a first order irreversible reaction A → B is
A $$\frac{{\text{k}}}{2}$$
B $$\ln \frac{{\text{k}}}{2}$$
C $$\ln \frac{2}{{\text{k}}}$$
D $$\ln \frac{{{\text{0}}{\text{.5}}}}{{\text{k}}}$$
Half-life period for a first order reaction is __________ the initial concentration of the reactant.
A Directly proportional to
B Inversely proportional to
C Independent of
D None of these
What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?
A 0
B 1
C 2
D 3
At the beginning of a class period, half of the students in a class go to the library. Later in the period, half of the remaining students go to the computer lab. If there are 8 students remaining in the class, how many students were originally in the cla
A 12
B 16
C 24
D 32
At the beginning of a class period, half of the students in a class go to the library. Later in the period, half of the remaining students go to the computer lab. If there are 5 students remaining in the class, how many students were originally in the class?
A 12
B 16
C 24
D 32
What is the average life of a radioactive atom having a 'half life period' of T?
A 1.44T
B 0.144T
C 14.4T
D 2T

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