increase physical activity

Take a nichrome wire of about 50 cm length and apply a potential difference of 1.5 V from a battery. Measure the current flowing through the wire using an ammeter connected to it in series, and note the potential difference across the resistance using a voltmeter connected across it. Note down and ..

Humidity is the amount of moisture (water vapor) present in the atmosphere. This moisture is due to the continuous evaporation of river, lakes, and oceans, and also from various life activities. At a given temperature, the maximum amount of water vapor that can be present is fixed. This i..

The atmosphere is the layer of air around the earth. It extends up to 1000 km above the surface of the earth and has a total weight of 4.5 10 1 8 kg (i.e., five million billion tons). This weight exerts a pressure on the surface of the earth which is called atmospheric pressure . At sea level i..

In 1960, T .H. Maiman constructed the first laser using a Ruby crystal. Ruby is a crystalline form of silica(Al 2 O 3 ) with a slight natural doping of chromium. It has the following advantages for being used as a laser. (i) It is a solid having suitably arranged energy levels. (ii) It is paramagne..

Bohr improved upon Rutherford model postulating that electrons can revolve around the nucleus in certain discrete, non-radiating orbits, called stationary orbits, for which total angular momentum of revolving electron is an integral multiple of h / 2 p where h is Planck's constant. Where n = 1,2,3&..

Remove air from a can by putting a little water into the can and boiling the water in it. The steam forces the air out. Close the opening and keep it below a tap, we find the can crumbling as the pressure inside the can is very small when compared to the pressure outside. ..

In the above arrangement where the cardboard is intact, water does not come out of the tumbler as the cardboard is balanced due to pressure of liquid in the tumbler and the atmospheric pressure from below. ..

Wet the rim of the plumber's force cup with water and press it against the wall to squeeze out most of the air. We find it difficult to pull the cup. (This simple principle is used to remove any blocks in holes of washbasin)..

Physical World and Measurement..

Communication Systems..