Questions in nuclei

Select	Question
	N atoms of a radioactive element emit n alpha particles per second. The half life of the element is
	A radioactive nucleus $_{92}{X^{235}}$decays to $_{91}{Y^{231}}$. Which of the following particles are emitted
	The radioactive nucleus $_7{N^{13}}$decays to $_6{C^{13}}$ through the emission of
	The counting rate observed from a radioactive source at t=0 second was 1600 counts per second and at t=8 seconds it was 100 counts per second. The counting rate observed, as counts per second at t=6 seconds, will be
	The radioactive decay of uranium into thorium is expressed by the equation$_{92}^{238}U \to _{90}^{234}Th + X,$where $'X'$is
	The relationship between $\lambda $and half life $({T_{1/2}})$of a radioactive substance is
	In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process
	The rate of disintegration of fixed quantity of a radioactive element can be increased by
	The half life (T) and the disintegration constant $(\lambda )$of a radioactive substance are related as
	The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be