Explain why the statement “the speed of light is 300 million m/s” is not always correct.

Because the speed of light is determined by the medium that is it in. If light is in a vacuum it goes 300 million meters per second but it is slower in air, and even slower in water because water is more dense than the previous two.

As given below.

Explanation:

Yes, the scientist should be concerned about the acid rain precipitation and thus its a concern of the new environmentalists as acidic rain is caused by the compounds of sulfur and nitrogen and gases released in the air. This is due to the dangerous composition of gases that develops due to industrial clustering and regarded as highly hazardous for plant and animal life. The reproduction rate of birds and forest ecosystem is affected by the presence of the acid precipitation as this rain has a lower pH and can cause sens of burning and a feeling of irritation. Even the soils can be damaged by this rain, as microbes are unable to tolerate the hazardous acids and high concentration leads the ground vulnerable to erosion agents like wind and water.