Physics

An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from ‘Iso’ meaning equal and ‘pleth’ means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. The more frequently drawn isopleths include Isotherm (equal temperature), Isobar (equal pressure), Isohyets (equal rainfall), Isonephs (equal cloudiness), Isohels (equal sunshine), contours (equal heights), Isobaths (equal depths), Isohaline (equal salinity), etc.

Water in pipes freeze in cold countries. Due to the anomalous expansion of water, it expands instead of contacting when there is a fall in temperature below 4°c. So, the water pipes burst due to the excess space consumed by the ice after freezing.

When a running car stops suddenly, the passenger tends to lean forward because of inertia of motion. according to Newton’s 1st law of motion, every bodies have nature to maintain inertia of rest or motion until there is no net force applied on that body.

When a man jumps out of a moving train, his feet suddenly comes to rest on touching the ground. But, the upper part of the body continues to be in motion and has a tendency to move forward. That is why the person falls with his head forward.

Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths. The single wavelength is called monochromatic radiation.

The illuminating powers of two sources are compared by a photometer.

p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increases and resistivity remains the same.

It is easy to burst a gas filled balloon with a needle than with a nail. It is because needle exerts more pressure on the bottom.

Moment of inertia depends on distribution of body, axis of rotation and mass of the body. It is not dependent on angular velocity of the body.

Moment of inertia depends on distribution of body, axis of rotation and mass of the body. It is not dependent on angular velocity of the body.