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Geothermal Energy

Geothermal en...

Question

Geothermal energy is produced by the :
(a) fission of radioactive materials
(b) burning of coal inside the coal mines
(c) combustion of natural gas deep inside the earth
(d) fusion of radioactive substances

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Solution

(a) fission of radioactive materials

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What type of combustion is represented by :

(a) burning of white phosphorus in air at room temperature

(b) burning of LPG in a gas stove ?

(c) ignition of a cracker ?

(d) burning of coal dust in a coal mine ?

Q. Coal is formed deep inside the earth under what conditions?

_{92}^{235} U

which must go nuclear fission to produce the same mass of energy as produced by 1 ton of coal. Given the heat of combustion of coal is

8 \times 10^{3} c a l / g

. The fission of

_{92}^{235} U

produces 200 MeV energy per fission.

(

1 c a l = 4.2 J; 1 t o n = 10^{6} g)

.

Q. Which form of energy is produced by burning of coal?

Q. Question 8
Which substance is formed by the carbonization of dead vegetation?

(a) Coal
(b) Coke
(c) Coal gas
(d) Coal tar

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