lead indicators

A small portion of sodium extract is acidified with acetic acid and lead acetate solution is added to it. A black precipitate of lead sulphide indicates the presence of sulphur...

Also called as mortality rate, it is the rate at which people die. It is also expressed as number of deaths occurring for every 1000 people per year. It gives an idea of reduction in population due to death. It negatively contributes to growth rate. It also indicates the level of health ..

Percentage of adult population is an important indicator for growth of population. A part of adult population may be reproductively active - which forms the basis of projections of birth rate and growth rate. Total adult population and classified data on adult population - sex wise,..

The arrow in the anticlockwise direction indicates E leads I by 90 o . The sinusoidal variation can also be represented as The alternating EMF across an inductor attains the maximum value well before the current attains its maximum value, and hence we say leads I by 90..

It does not give any indication regarding the production or absorption of heat. This is mentioned separately. Some reactions are reversible. They are represented ..

A report by scientists at the United Nations Environment Program (UNEP) said the Asian Brown haze is a three kilometer deep blanket of pollution in the sky, which stretches across South Asia, and has been caused by the spectacular economic development experienced by this part of the world. The haz..

Growth of Population - Population of a country should grow reasonably to match with growth in its gross domestic product to maintain the existing standard of living. Reducing growth or negative growth in population may be desirable if the standard of living should increase by more favourable per ca..

>'Z' represents the total effective opposition offered by LCR circuit to AC and is called impedance. q is the phase angle which indicates that effective EMF leads the current (provided E L > E C ). If I = I o sin w t then the voltage in the LCR circuit would be E = E o sin ( ..

According to wave mechanics, we cannot simply say that the electron exists at a particular point but we talk about certain regions in space around the nucleus where the probability of finding the electron is maximum. Such regions are expressed by mathematical expressions and are called orbital wave..

Smoking during pregnancy can cause number of deformities and irregularities of foetal growth. It can even lead to miscarriages. Due to all such possible diseases, consumption of tobacco in any form is necessary to be curbed. 31 s t May is observed as 'No Tobacco Day' all over the world..