Physics Test 82

Result

Physics Test 82

Score
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out of -
Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

If ₉₂U²³⁸ changes to ₈₅At²¹⁰ by a series of α-and β-decays, the number of α-and β-decays undergone is :-

A
7 and 7

B
7 and 5

C
5 and 7

D
14 and 5

Solution

₉₂U²³⁸ → ₈₅At²¹⁰ + x ₂α⁴ + y _–1e⁰

238 = 210 + 4x + y × 0

x = 28/4= 7

92 = 85 + 2x – y

92 = 85 + 14 – y

y = 7
Question 2
4 / -1

The width of the depletion layer of a junction:-

A
Decreases with light doping

B
Increases with heavy doping

C
Is independent of applied voltage

D
Increases under reverse bias

Solution

In R.B, the width of depletion layer increases.