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Theory of radioactive di..



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Q1. A freshly prepared radioactive source of half-time 2h emits radiation of intensity which is 64 times the permissible safe level. Minimum time after which it would be possible to work safely with this source is which of the following?

(a) 6 h
(b) 12 h
(c) 24 h
(d) 20 h

Q2. What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?

(a) Half of the active nuclei decay
(b) Less half of the active nuclei decay
(c) More than half of the active nuclei decay
(d) All active nuclei decay

Q3. What is the half-time of a radioactive sample (in minutes), if its mean life is 200 s?

(a) 0.69 min
(b) 2 min
(c) 2.57 min
(d) 2.31 min

Q4. Which will be the unknown nucleus formed when 22Ne10 decays into two ?-particles and an unknown nucleus?

(a) Fluorine
(b) Carbon
(c) Neon
(d) Oxygen

Q5. Emission of ?-rays in radioactive decay results in the change of either mass or charge.

(a) True
(b) False
(c) Both acidolysis and aldehyde
(d) None of the mentioned

Q6. A 300-day old radioactive substance shows an activity of 5000 dps, 150 days later its activity becomes 2500 dps. What was its initial activity?

(a) 25000 dps
(b) 20000 dps
(c) 32000 dps
(d) 5000 dps

Q7. Find the probability that the nucleus of 87Ra221 undergoes decay after three half-lives, if its a radioactive substance which has a half-life of 6 days.

(a) 16
(b) 32
(c) 56
(d) 12

Q8. The electron emitted in ? ? radiation originates from where?

(a) Inner orbits of atoms
(b) Free electrons existing in nuclei
(c) The decay of a neutron in nuclei
(d) Photon escaping from the nucleus

Q9. Which of the following substances cannot be emitted by radioactive substances during their decay?

(a) Protons
(b) Neutrinos
(c) Helium nuclei
(d) Electrons

Q10. Radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains?

(a) 1080
(b) 2430
(c) 3240
(d) 4860


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355 views

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

Modified 230 Year Ago

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On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

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β-particle Is Emitted In A Radioactive Reaction When

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β-particle Is Emitted In A Radioactive Reaction When

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The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

Modified 5 Year Ago

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The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

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When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

Modified 5 Year Ago

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264 views

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

Modified 5 Year Ago Neysa

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5 Year Ago

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

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0 Answer
257 views

Which Of The Following Nuclear Transformation Is (n, P) Type

Modified 230 Year Ago Ankush Sharma

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230 Year Ago

Which Of The Following Nuclear Transformation Is (n, P) Type

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