Physics

Pressure is a scalar quantity.

The information of brilliant colors in a thin soap film is a consequence of the phenomena of multiple reflection and interference.

Ice packed in sawdust does not melt quickly because it provides insulation.

Among all the four water has the highest specific heat.

A freely suspended magnet remains horizontal at the magnet equator.

Planck’s constant has the dimensions of energy.

Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.

Second and third class levers are differentiated by the location of the load.

Kinetic energy = 1/2mv_x000D_ = 1/2*10*2_x000D_ = 1/2*10*4_x000D_ = 5*4_x000D_ = 20 J

The ozone layer is a layer in Earth’s atmosphere containing relatively high concentrations of ozone (O3). The ozone layer absorbs 97–99% of the Sun’s medium frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth. Although the concentration of the ozone in the ozone layer is very small, it is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation coming from the sun. Extremely short or vacuum UV (10-100 nm) is screened out by nitrogen.