Questions in nuclei

Select	Question
	Which of the following processes represents a gamma-decay
	The half-life of $^{215}At$ is $100\mu s$. The time taken for the radioactivity of a sample of $^{215}At$ to decay to 1/16th of its initial value is
	The half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its $\frac{1}{{16}}$ th part
	A radioactive substance has an average life of 5 hours. In a time of 5 hours
	Which of the following rays are not electromagnetic waves
	A sample of radioactive element has a mass of 10 gm at an instant t = 0.The approximate mass of this element in the sample after two mean lives is
	Which of the following radiations has the least wavelength
	A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is
	A nucleus with Z = 92 emits the following in a sequence: $\alpha ,\,{\beta ^ - },\,{\beta ^ - },\,\alpha ,\alpha ,\alpha ,\alpha ,\alpha ,{\beta ^ - },\,{\beta ^ - },\alpha ,\,{\beta ^ + },\,{\beta ^ + },\,\gamma$. The Z of the resulting nucleus is
	Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called