According to Marx, the source of value is
The ordinary and maximum tolerance limit of sound by human being is
The Particulate Matter (PM-10) exhaled from the polluted atmosphere is often filtered out during the process of
The concept of 'Green House Gases' was postulated by
Blood pressure may be increased by the excessive secretion of
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in