How to earn money online by using smartphone


 

 

I am Saheb Sarkar from purnea .

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What are the Characteristics of a Sound Wave ?

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    Characteristics of a           Sound Wave Sound is a longitudinal wave which consists of compressions and rarefactions travelling through a medium. A sound wave can be described completely by five characteristics :  Wavelength, Amplitude, Time-period,Frequency  and Velocity (or Speed) 1. Wavelength  The minimum distance in which a sound wave repeats itself is called its wavelength. In most simple words, it is the length of one complete wave. The wavelength is denoted by the Greek letter 'Lambda'. In a sound wave the combined length of a compression and in its adjacent rarefaction is called its wavelength. The SI unit of measuring wavelength is metre (m). Sometimes, however, centimetre unit is also used for expressing wavelength. 2. Amplitude  When a wave passes through a medium, the particles of the medium get displace temporarily from the original undisturbed positions.  The maximum displacement of the particles of t...
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Derivation of equations of uniformly accelerated motion

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1. First Equation of Motion                 The first equation of motion is :   V = u + at. It gives the velocity acquired by a body in time t. We will now derive this first equation of motion.              Consider a body having initial velocity 'u'. Suppose it is subjected to a uniform acceleration 'a' so that after time 't' it's final velocity becomes 'v'. Now , from the definition of acceleration we know that :               Acceleration  = Change in velocity                                                       Time taken  Or   Acceleration  =    final velocity- Initial velocity                             ...
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What are the factors Affecting Buoyant Force ?

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                                                            Buoyancy The tendency of a liquid to exert an upward force on an  object place in it, is called buoyancy. In general, whenever an object (or body) is immersed in water (or any other liquid),it appears to lose some weight and feels lighter.                         Buoyant Force When in object is immersed in a liquid, it experiences an upward force.This upward force is called buoyant force. Thus, the upward force acting on an object immersed in a liquid is called buoyant force.  It is due to the upward 'buoyant force' exerted by a liquid that the weight of an object appears to be less in the liquid than its actual weight in the air.          ...
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