Power definition The rate of doing work is called power. From the statement of work it is not clear that same amount of work done in one second or in 1 hour.The rate at which work done is often interest in practical applications. Power formula physics Average power formula The ratio of total work to the total time is called ...

Read More »## First equation of motion in physics

First equation of motion derivation Consider a body is moving with initial velocity “Vi” with uniform acceleration “a” as shown in figure.After time “t” its velocity becomes “Vf”.The total distance covered by a body is under the straight line AB which is shaded as shown in figure.The slope of line AB is acceleration “a”.1st equation of motion can be obtained ...

Read More »## Difference between reversible and irreversible process in thermodynamics with examples

Reversible and irreversible process Reversible process in thermodynamics “A process which can be retracted in exactly reverse order without producing any change in the surroundings is called reversible process”. In the reverse process, the system passes through the same stages as in the direct process but thermal and mechanical effects at each stage are exactly reverse. If heat is absorbed ...

Read More »## Do interference effects occur for sound waves?

Yes,interference effect occurs for sound waves despite of the fact that sound waves are longitudinal waves.When two sound waves of same frequency and same amplitude in the same direction superpose then the interference of sound waves occurs. For example two loudspeakers emit two harmonic sound waves of fixed frequency produced by an audio generator.When these waves combine at a point ...

Read More »## Why radio waves diffract around buildings?

Diffraction of radio waves The phenomenon of bending of waves around the corners of an obstacle or opening placed in its path is called diffraction.The phenomenon is found to be prominent when wavelength of the waves is comparable with the size of the obstacle or opening. Radio waves are of large wavelengths and the size of obstacles and openings of ...

Read More »## Kelvin to celsius conversion formula

How to convert kelvin to celsius Temperature on Celsius scale can be converted into kelvin by subtracting 273 from temperature in kelvin scale. Kelvin to celsius formula C = T (k) – 273 Kelvin to celsius example problems Convert 300 kelvin to Celsius Solution: T = 300 k Formula: C = T (k) – 273 C = (300 ...

Read More »## Celsius to kelvin conversion formula

Convert celsius to kelvin The temperature on kelvin scale can be converted by adding 273 in the temperature Which is in degree centigrade C on Celsius scale. Celsius to kelvin formula T (k) = 273 + C 0 Celsius to kelvin C = 0 ºC As T = 273 + C T = 273 + 0 ...

Read More »## Why diffraction grating have closely spaced rulings?

A diffraction grating is a glass plate having a large number of close parallel equidistant slits mechanically ruled on it.A diffraction grating is used to study the diffraction effects of light. Since the phenomenon of diffraction is found to be prominent when the wavelength of light is large as compared with the size of the opening or aperture of the ...

Read More »## Difference between latent heat of fusion and latent heat of vaporization of water

Latent Heat of Fusion Heat energy required to change unit mass of a substance from solid to liquid state at its melting point without change in its temperature is called its latent heat of fusion. When a substance is changed from solid to liquid state by adding heat, the process is called melting or fusion. The temperature at which a ...

Read More »## micrometer screw gauge measurement with least count formula

What is the micrometer screw gauge? It is an instrument used to measure diameter of thin wires, thickness of small sheets of glass,plastic etc. It can measure upto 1/10 of mr (or 0.01 mm= 0.001 cm) which is usually called the least count of screw gauge. Parts of micrometer screw gauge It consists of a U-shaped metal frame F with ...

Read More »