[ Radioactive isotopes employed to Skudy chatago thisă cum A) "C and 320 B) 15 and 3 Str and d) thc and 180

(a) What are radioactive isotopes ? Give two examples of radioactive isotopes (b) Give any two uses of ratioactive isotopes (c) An element Z contains two naturally occuring isotopes ._(17)^(35) Z and ._(17)^(37)Z . If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

Which of the following radioactive isotopes is used for the diagnosis of hyperthy roidism? a. Co^(60) b. P^(32) c. 1^(131) c. C^(14)

Which of the following radioactive isotopes is used for the diagnosis of hyperthy roidism? a. Co^(60) b. P^(32) c. 1^(131) c. C^(14)

In a sample initially there are equal number of atoms of two radioactive isotopes A and B. 3 days later the number of atoms of A is twice that of B. Half life of B is 1.5 days. What is half life of isotope A? (in days)

In a sample initially there are equal number of atoms of two radioactive isotopes A and B. 3 days later the number of atoms of A is twice that of B. Half life of B is 1.5 days. What is half life of isotope A? (in days)

Among alkali metals, radioactive element is ---- and half-life period of its longest lived isotope is (A) Francium and 21 years (B) Radium and 21 minutes (C) Francium and 21 minutes (D) Radium and 21 days

Structures of nuclei of three atoms A ,B and C are given belo A has 90 protons and 146 neutrons , B has 92 protons and 146 neutrons , C has 90 protons and 148 neutrons . Based on the above data,which of these atoms are isotopes and which are isobars? (1) A and B are isotopes; A and C are isobars (2) A and C are isotopes; B and C are isobars (3) A and C are isotopes; A and B are isobars (4) B and C are isobars; A and B are isotopes.

1.0 g of a radioactive isotope left 125 mg after 24 hr. The half-life period of the isotope is a. 8 hr b. 24 hr c. 6 hr d. 4 hr

1.0 g of a radioactive isotope left 125 mg after 24 hr. The half-life period of the isotope is a. 8 hr b. 24 hr c. 6 hr d. 4 hr

A radioactive isotope X^A becomes Y^(A-4) after decay. Which of the following radioactive emissions are not possible in this case? (A) alpha (B) beta (C) meson (D) positron