Advertisements
Advertisements
Question
Half life of a certain radioactive material is 8 hours.
If one starts with 600 g of this substance, how much of it will disintegrate in one day?
Solution
Since the half-life is 8 hours, therefore, the mass of radioactive material left after 8 hours = `600/2 = 300"g"`
∴ After another 8 hours, mass left = `300/2 = 150"g"`
Similarly, after another 8 hours mass left = `150/2 = 75 "g"`
After one day 75 g of the substance will remain.
APPEARS IN
RELATED QUESTIONS
Write nuclear reaction equation for α-decay of `""_94^242"Pu"`.
Write nuclear reaction equation for β+-decay of `""_43^97"Tc"`.
Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
A certain sample of a radioactive material decays at the rate of 500 per second at a certain time. The count rate falls to 200 per second after 50 minutes. (a) What is the decay constant of the sample? (b) What is its half-life?
The half-life of a radioisotope is 10 h. Find the total number of disintegration in the tenth hour measured from a time when the activity was 1 Ci.
A vessel of volume 125 cm3 contains tritium (3H, t1/2 = 12.3 y) at 500 kPa and 300 K. Calculate the activity of the gas.
4 × 1023 tritium atoms are contained in a vessel. The half-life of decay tritium nuclei is 12.3 y. Find (a) the activity of the sample, (b) the number of decay in the next 10 hours (c) the number of decays in the next 6.15 y.
A charged capacitor of capacitance C is discharged through a resistance R. A radioactive sample decays with an average-life τ. Find the value of R for which the ratio of the electrostatic field energy stored in the capacitor to the activity of the radioactive sample remains constant in time.
Copy and complete the following table for a radioactive element whose half-life is 10 minutes. Assume that you have 30g of this element at t = 0.
A nucleus with Z = 92 emits the following in a sequence:
α, β‾, β‾, α, α, α, α, α, β‾, β‾, α, β+, β+, α
Then Z of the resulting nucleus is ______.
