Question

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Answer 1

1. One coloumb charge contains 1.6 * 10^-19 electrons.

2. .....

Answer 2

Answer:

i) (c) $6.25 \times 10^{18}$ electrons.

ii) (b) 80,000 cal/gram °C

Explanation:

i)

Given :

To find the no. of electron 1 Coulomb constitute

Solution :

We know that, 1 electron constitute

$1.6 \times 10^{-19}$ Coulomb

So,

No. of electrons constitute 1 Coulomb of charges is ,

⇒ $\frac{1}{1.6 \times 10^{-19}}$ ≈ $6.25 \times 10^{18}$

ii)

Given :

To find the quantity of heat required to raise the temperature of 2000 grams of water from 10°C to 50°C,

(specific heat of water = 1 cal/gram . °C

Solution :

We know that,

Heat required = $m.c.\Delta T$

⇒ 2000 g ×  1 cal/g×°C × (50 - 10)°C

⇒ 40 × 2000 cal = 80,000 calories