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1461. λ is ……………..constant



1462. Mass number A refers to:



1463. There are initially 400 atoms in a radioactive substance. What would be the number of atoms after 3 half-lives?



1464. Alpha particle has same electrons as:



1465. 32g of radioactive element decays and remains 2g after 60 days. Its half-life is:



1466. 32g of a radioactive element decays and remains 2g after 60 days. What is the half-life of the radioactive element?



1467. 189F=188O +X+Y+Q



1468. Heavy nuclei of atoms go through fission so that they can:



1469. In nuclear reaction ₇N¹⁴ + ₂He⁴ → ₈O¹⁷ + __, the missing particle is:



1470. Geiger Muller Counter's wire is maintained at:



1471. Which one is a stable element among the following?



1472. Which photon is travelling with the largest speed in vacuum?



1473. The Decay constant of Na is 0.0000128 /s, the half life of Na is ?



1474. Positive rays are also called:



1475. High speed beta rays are:



1476. What are the particles emitted in a nuclear reaction in which nuclei are bombarded by protons, the ⁴Be nuclei are produced:



1477. A low energy neutron has RBE factor of 10. How much energy is absorbed by a man of mass 80kg if the value equivalent dose is 400 rem?



1478. It has been observed that Thorium ⁹⁰Th²³⁴ is transformed into protactinium Pa²³⁴ after the emission of –particle:



1479. The SI unit of equivalent dose is:



1480. The relation between gray and rad is given as:



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