What is an advantage of using wind for producing electricity instead of coal?
a)a lot of energy is produced by wind compared to coal.
b)obtaining wind does not harm the environment, but obtaining coal does.
c)using wind is less expensive than using coal.
d)wind is abundant in certain areas, and coal is not abundant.

b)Obtaining wind does not harm the environment, but obtaining coal does.

Explanation:

While producing electricity from coal we have to burn the coal by which we got the thermal energy and then this thermal energy is used to drive the turbine which will convert the mechanical energy into electrical energy.

Now when we produce the electricity by above procedure then in this case there are two drawbacks

1). Burning of Coal : Due to which there is air pollution which will harm the environment.

2) Extraction of coal : Since coal is non renewable source so we can't extract the large amount of coal.

While if we use wind energy then in that case kinetic energy of wind is used to rotate the turbine and then we can easily convert mechanical energy into electric energy.

So here correct answer will be

b)Obtaining wind does not harm the environment, but obtaining coal does.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

grav potential energy