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Byju's Answer

Standard X

Physics

Alpha Decay

Assertion : ...

Question

Assertion : ${_{z} X}^{A}$ undergoes $2$ $α$ - decays, $2$ $β$ - decays (negative $β$ ) and $2$ $γ$ -decays. As a result , the daughter product is ${_{z - 2} Y}^{A - 8}$ Reason: In $α$ - decay, the mass number decreases by $4$ unit and atomic number decreases by $2$ unit. In $β$ - decay (negative $β$ ), the mass number remains unchanged and atomic number increaess by $1$ unit. In $γ$ -decay, mass number and atomic number remain unchanged

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Statement I is correct
$_{Z} X^{A} ⟶_{Z - 2} X^{A - 8} + 2 α - p a r t i c l e s + 2 e + 2 γ$
Statement II is true by definition and correctly explains

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Similar questions

Q. Assertion :

_{Z} X^{4}

undergoes

2 α - d e c a y s, 2 β - d e c a y s

(negative

β

), and

2 γ - d e c a y s

. As a result, the daughter product is

_{z - 2} Y^{A - B}

Reason: In

α - d e c a y

, the mass number decreases by 4 unit and atomic number decreases by 2 unit. In

β - d e c a y

(negative

β

), the mass number remains unchanged and atomic number increases by 1 unit. In

γ - d e c a y

, mass number and atomic number remain unchanged.

Q. STATEMENT - 1 :

_{Z} X^{A}

undergoes 2

α

decays, 2

β

decays (negative

β

) and 2 decays. As a result the daughter product is

_{Z - 2} Y^{A - 8} .

STATEMENT -2 : In

α

decay the mass number decreases by 4 unit and atomic number decreases by 2 unit. In

β

decay (negative

β

) the mass number remains unchanged and atomic number increases by 1 unit. In

γ

decay, mass number and atomic number remains unchanged.

Q. When a nucleus with atomic number

Z

and mass number

A

undergoes a radioactive decay process,

(1)

Both

Z

and

A

will decrease, if the process is

α

decay.

(2)

Z

will decrease, but

A

will not change, if the process is

β^{+}

decay.

(3)

Z

will increase, but

A

will not change, if the process is

β^{-}

decay.

(4)

Z

and

A

will remain unchanged, if the process is

γ

decay.

Q. When a nucleus, having atomic number

Z

and mass number

A

, undergoes a radioactive decay process,

1) Both

Z

and

A

will decrease, if the process is

α

decay.
2.)

Z

will decrease but

A

will not change, if the process is

β^{+}

decay.
3.)

Z

will increase but

A

will not change, if the process is

β^{-}

decay
4.)

Z

and

A

will remain unchanged, if the process is

γ

decay

Q. A nuclide has mass number

(A)

and atomic number

(Z)

. During a radioactive process if
1. both

A

and

Z

decrease, the process is called

α

-decay.
2.

A

remains unchanged and

Z

decreases by one, the process is called

β^{+}

or positron decay or

K

-electron capture.
3. both

A

and

Z

remain unchanged, the process is called

γ

-decay.
4. both

A

and

Z

increase, the process is called nuclear isomerism.
The correct answer is:

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The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionStatement I is correctZXA⟶Z−2XA−8+2α−particles+2e+2γStatement II is true by definition and correctly explains

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Statement I is correct
$_{Z} X^{A} ⟶_{Z - 2} X^{A - 8} + 2 α - p a r t i c l e s + 2 e + 2 γ$
Statement II is true by definition and correctly explains