Name two acids that are usually present in rain water.
Name two acids that are usually present in rain water.
Sulphuric acid (H2OS4) and Nitirc acid (HNO3) are present in acid rain. Sulphur oxides and oxides of nitrogen combine with water and oxygen in air and fall on earth as acid rain in the form of Sulphur and nitric oxides.
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A person has a hearing range from 20Hz to 20kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344ms–1 .
What is ODS?
Each beehive consists of thousands of hexagonal thin-walled fragile cells. Name the material which is used to make these cells and mention the significance of the hexagonal shape of the cell.
A person is listening to a tone of 500Hz sitting at a distance of 450m from the source of the sound. What is the time interval between successive compressions from the source?
