1) मधुमक्खी का छत्ता बनाने के लिए कितना समय लगता होगा-
2) चिड़िया का घोंसला बनाने के लिए कितने समय लगता होगा-
3) आम का बाग बनाने के लिए कितना समय लगता होगा-
Please tell the correct answer.
Please
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3 se 4 hafte
4 se 5 ghante
4 se 5 saal.
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\huge\sf\red{Answer:}Answer:
6.25 × 10¹⁸ electrons are flowing through the cross section of the conductor .
Explanation :-
We have :-
→ Current (I) = 20 mA
→ Time taken (t) = 50 seconds
→ Charge of an electron (e) = 1.6 × 10⁻¹⁹ C
To find :-
→ Number of electrons (n) .
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Firstly, let's convert the given unit of current from mA to A .
⇒ 1 mA = 0.001 A
⇒ 20 mA = 20(0.001)
⇒ 0.02 A
Now, we know that :-
I = Q/t
⇒ I = ne/t
⇒ 0.02 = (n × 1.6 × 10⁻¹⁹)/50
⇒ 0.02(50) = 1.6 × 10⁻¹⁹ n
⇒ 1 = 1.6 × 10⁻¹⁹ n
⇒ n = 1/(1.6 × 10⁻¹⁹)
⇒ n = 1/1.6 × 1/10⁻¹⁹
⇒ n = 0.625 × 10¹⁹
⇒ n = 6.25 × 10¹⁸
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