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Standard VII

Chemistry

Sub-Atomic Particles

Which of the ...

Question

Which of the following is called secondary emission?

Positron emission

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K-electron capture

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γ

-emission

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α

-emission

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Solution

The correct option is C $γ$ -emission
$γ$ -emission is called secondary emission.
$γ$ -emissions are followed by emission of either $α$ or $β$
Gamma rays are very high frequency electromagnetic waves usually emitted from radioactive decay.
Natural sources of gamma rays include gamma decay from naturally occurring radioisotopes such as potassium-40, and also as a secondary radiation from atmospheric interactions with cosmic ray particles.

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Similar questions

Q. Decrease in atomic number is observed during :
A)

α

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B)

β

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C) positron emission
D) electron capture

^{64} C u

(half-life-12.8 hr) decays by

β^{-}

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β^{+}

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Q. Which of the following statements is/are correct?
1. A nucleus in an excited state may give up its excitation energy and return to the ground state by emission of electromagnetic

γ

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2.

γ

-radiations are emitted as secondary effect of

α

and

β

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3. The nuclear isomers produced by

γ

-ray bombardment have the same atomic and mass number but differ in their lifetimes (whatever their ground state may be).
4.

X

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γ

-ray are both electromagnetic.

For the (positron) emission from a nucleus, there is another competing process known as electron capture (electron from an inner orbit, say, the K−shell, is captured by the nucleus and a neutrino is emitted).

Show that if emission is energetically allowed, electron capture is necessarily allowed but not vice−versa.

Q. For the

β^{+}

(positron) emission from a nucleus, there is another competing process known as electron capture (electron from an inner orbit, say, the K shell, is captured by the nucleus and a neutrino is emitted).

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Show that if

β^{+}

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