A 280 day old radioactive substances sho...

A 280 day old radioactive substances shows an activity of 6000 dps, 140 days later its activity becomes 3000 dps. What was its initial activity ?

A

20000 dps

B

24000 dps

C

12000 dps

D

6000 dps

Text Solution

Verified by Experts

The correct Answer is:

b

Topper's Solved these Questions

NUCLEI
NCERT FINGERTIPS|Exercise Nuclear Energy|10 Videos
NUCLEI
NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos
NUCLEI
NCERT FINGERTIPS|Exercise Mass Energy And Nuclear Binding Energy|9 Videos
MOVING CHARGES AND MAGNETISM
NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos
PRACTICE PAPPER
NCERT FINGERTIPS|Exercise Practice Paper 3|50 Videos

Similar Questions

Explore conceptually related problems

A 280 days old cative substance shown an activity of 6000 dps 100 days later its activity between 3000 days what was its initial activity ?

After 280 days, the activity of a radioactive sample is 6000 dps. The activity reduces to 3000 dps after another 140 days. The initial activity of the sample in dps is

A sample of radioactive substance loses half of its activity in 4 days. The time in which its activity is reduced to 5% is

A radioactive sample has initial activity of 28 dpm 30 minutes later its activity 14 dpm . How many atoms of nuclide were present initially?

After 300 days, the activity of a radioactive sample is 5000 dps (disintegrations per sec). The activity becomes 2500 dps after another 150 days. The initial activity of the sample in dps is

A radioactive sample has an initial activity of 50 dpm, 20 minute later, the activity is 25 dpm . How many atoms of the radioactivity nuclide were there originally?

The half life of a radioactive substance is 5xx10^(3) yrs. In how many years will its activity decay to 0.2 times its initial activity? Take log_(10) 5=0.6990 .

A radioactive substance contains 10^15 atoms and has an activity of 6.0xx10^11 Bq. What is its half-life?

The activity of a radioactive sample initially is 3200 dps and after 8hours activity is 100 dps. What will be the activity after 4.8hr from start in dps?

The activity of a radioactive substance is readuced by 80% in 100 days. Its half life is

NCERT FINGERTIPS-NUCLEI-Radioactivity

Two samples X and Y contain equal amount of radioactive substances. If...
Text Solution
|
The decay constant of a radioactive isotope is lambda. If A1 and A2 ar...
Text Solution
|
A 280 day old radioactive substances shows an activity of 6000 dps, 14...
Text Solution
|
Tritium has a half life of 12.5 years against beta decay. What fractio...
Text Solution
|
The decay constant , for a given radioactive sample, is 0.3465 "day"^(...
Text Solution
|
The count rate of a radioactive sample falls from 4.0xx10^6 s^(-1) to ...
Text Solution
|
Carbon dating is best suited for determining the age of fossils of the...
Text Solution
|
The half life of radioactive Radon is 3.8 days . The time at the end o...
Text Solution
|
A radioactive element X with half life 2 h decays giving a stable elem...
Text Solution
|
The half life of .38^90Sr is 28 years. The disintegration rate of 15 m...
Text Solution
|
A sample of a radioactive element has a mass of 10 g at an instant t=0...
Text Solution
|
The count rate from 100cm^(3) of a radioactive liquid is c. Some of th...
Text Solution
|
The variation of decay rate of two radioactive samples A and B with ti...
Text Solution
|
A sample of radioactive material has mass m, decay constant lambda, an...
Text Solution
|
Two radioactive substance A and B have decay constants 5 lambda and la...
Text Solution
|
Plutonium decays with half life of 24000 years. If plutonium is stored...
Text Solution
|
A fraction f1 of a radioactive sample decays in one mean life, and a f...
Text Solution
|
The activity of a radioactive sample is measures as N0 counts per minu...
Text Solution
|
The number of beta particles emitter by radioactive substance is twice...
Text Solution
|
During negative B decay, an anti- neutrino is also emmited along with ...
Text Solution
|