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Author Archives: admin

Black body radiation and planck’s radiation law

Black body radiation basics When a body is heated,it emits radiation.The nature of the radiation depends upon the temperature.At low temperature,a body emits radiation which is principally of long wavelengths in the invisible infrared region.At high temperature ,the proportion of shorter wavelength radiation increases. Furthermore,the amount of emitted radiation is different for different wavelengths.It is of interest to see how ...

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What is laser? how does it works?

What is laser? The name “LASER” stands for light Amplification by Stimulated Emission of Radiation.The lasers are used to produce light having following properties: Monochromatic Directionality Brightness Coherence Polarization One of the most important property of laser light is its monochromaticity. The word monochromatic comes from Greek word monos means single and chroma means colour. actually all lasers have very ...

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Photoelectric effect:Definition,equation,applications and problems

What is photoelectric effect? “When light of suitable frequency falls on a metal surface, electrons are emitted from the metal surface.This phenomenon is called photoelectric effect.” The electron emitted in this process are known as photoelectric. Explanation Experimental Setup for photoelectric effect The apparatus used to observe the photoelectric effect is shown in above Figure: It consists of an evacuated ...

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speed of sound in solid,liquid and gas with formula

What is speed of sound? Sound waves can be transmitted by any medium containing particles that can vibrate.They cannot pass through vacuum.However,the nature of the medium will affect the speed of the sound waves.In general,the speed of sound in a liquid is five times that in gases;the speed of sound in solid is about fifteen times that in gases.The speed ...

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sound waves:types,properties,characteristics with examples

Sound waves physics definition “Sound is a form of energy that is passed from one point to another as a wave.” Sound waves longitudinal or transverse Sound is an example of a longitudinal wave.One major reason for learning about sound is that we experience it every moment of our lives in the form of music,noise and communication.From the large vocabulary ...

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Polarization of light:definition,types,uses and examples

What is polarization of light? “Separation of light waves with electric field vector oriented only in a single direction is called polarization or this is a process in which light and other radiations are restricted to vibrate in a single direction only and therefore the electric/magnetic field of the wave is unsymmetrical.” In 1808 Etienne Louis Malus (1775-1812) accidentally observed ...

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Different types of waves in physics with examples

What is wave? Waves transport energy without transporting matter. The energy transportation is carried by a disturbance,which spreads out from a source. We are well familiar with different types of waves such as water waves in the ocean, or gently formed ripples on a still pond due to rain drop. When a musician plucks a guitar-string, sound waves are generated ...

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Doppler effect equation and applications with cases

What is Doppler effect? “The apparent change in the frequency due to relative motion between source and observer is known as Doppler effect.” When a listener is in motion toward a stationary source of sound ,the pitch (frequency) of the sound heard is higher than when the listener is at rest.If the listener is in motion away from the stationary ...

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First law of thermodynamics:Definition,examples and applications

First law of thermodynamics statement When heat is added to a system there is an increase in the internal energy due to the rise in temperature,an increase in pressure or change in the state.If at the same time,a substance is allowed to do work on its environment by expansion,the heat Q required will be the heat necessary to change the ...

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Torque:definition,formula,unit and examples

Definition of torque in physics “The turning effect of a force is called torque or moment of the force.” We open or close a door by pushing or pulling it.Here push or pull turn the door about its hinge or axis of rotation.The door is opened or closed due to the turning effect of the force acting on it. Before ...

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