EASY
Earn 100

What is activity of a radioactive substance?

Important Questions on Radioactivity

HARD
Physics>Atomic Physics>Radioactivity>Radioisotopes
Suppose the mass of carbon in the bones of a dead organism is 500 g and the activity is measured to be 30 atoms/second. How old is the organism? Let the decay constant λ of C‐14 to be 3.83×10-12 s-1. 
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Physics>Atomic Physics>Radioactivity>Radioisotopes
An intense dose of radiation causes a lot of ionization in a cell, which can _____ the cell.
MEDIUM
Physics>Atomic Physics>Radioactivity>Radioisotopes
The age of a dead animal can be determined by using an isotope of _____.
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Physics>Atomic Physics>Radioactivity>Radioisotopes
Describe carbon dating.
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Physics>Atomic Physics>Radioactivity>Radioisotopes
Write two units of radioactivity. How are they interrelated?
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Physics>Atomic Physics>Radioactivity>Radioisotopes
The age of rock can be estimated by 
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Physics>Atomic Physics>Radioactivity>Radioisotopes
Find the value of a, if the ratio of the mass needed to generate 1 μCi of Ra88226 t1/2=1622 yr to that for 1 μCi of Rn86222 t1/2=3.825 d is a×105 (scientific form).
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Physics>Atomic Physics>Radioactivity>Radioisotopes
One becquerel of radioactivity is equal to
EASY
Physics>Atomic Physics>Radioactivity>Radioisotopes
Which of the following is a radioisotope?
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Physics>Atomic Physics>Radioactivity>Radioisotopes
Unit of radioactivity is
MEDIUM
Physics>Atomic Physics>Radioactivity>Radioisotopes
An isotope of protactinium (symbol Pa) has 91 protons and 140 neutrons in its nucleus. Write the symbol for this nuclide.
MEDIUM
Physics>Atomic Physics>Radioactivity>Radioisotopes
What is radio carbon dating?
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Physics>Atomic Physics>Radioactivity>Radioisotopes
Unit of radioactivity is
MEDIUM
Physics>Atomic Physics>Radioactivity>Radioisotopes
Explain artificial radioactivity with examples.
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Physics>Atomic Physics>Radioactivity>Radioisotopes
Anaemia can be diagnosed by
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Physics>Atomic Physics>Radioactivity>Radioisotopes
How does radiation affects a cell?
MEDIUM
Physics>Atomic Physics>Radioactivity>Radioisotopes
STATEMENT-1: Specific activity of the same radioactive substance is same for 10g radioactive substance as well as 50g radioactive substance.

STATEMENT-2: Specific activity of a radioactive substance is its activity per g.
HARD
Physics>Atomic Physics>Radioactivity>Radioisotopes
Tritium, H13 has a half-life of 12.26 year. A 5.00 ml sample of tritiated water has an activity of 2.40×109 cpm. How many years will it take for the activity to fall to 3.00×108 cpm?
EASY
Physics>Atomic Physics>Radioactivity>Radioisotopes
One becquerel of radioactivity is equal to
EASY
Physics>Atomic Physics>Radioactivity>Radioisotopes
A cobalt specimen emits induced radiation of 75.6 millicurie per second. Convert this disintegration in to becquerel (one curie =3.7×1010 Bq).