A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?

Similar Questions

The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when...

In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17...

Using the data on the diagram above, calculate the potential difference across the 20- Ω resis...

A boat is rocked by waves of speed 30ms-1 whose successive crest are 10m apart. Calculate the rate a...

A projectile fired with initial velocity, u will attain its maximum height H when the angle of proje...

The half-life of a radioactive substance is 2 seconds. Calculate the decay constant. ...

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the fo...

Which of the following radiations has it's frequency lower than that of infrared radiation? ...

Which of the following statements explains lost volt in an electric circuit? The ...

Which of the following statements about a neutral atom is correct? The ...