class xi physics

upto three significant digits. If the gas contains n moles, the number of molecules is Using this, equation (x) becomes where R = N A k, is another universal constant known as the universal gas constant. Its value is R = 8.314 J/mol-K Equation (xi) is known as the equation of state of an ..

If we evaluate the increase in volume of the liquid taking into account the expansion of the vessel also, then we say it is absolute expansion of the liquid. We can show that, The coefficient of absolute expansion of a liquid = coefficient of apparent expansion + coefficient of cubical expansion of..

. The larger the volume, the longer it takes for sound traveling at approximately 345 ms - 1 , to traverse the distances between the reflecting walls. When surfaces exposed to sound waves are highly absorbent, the rate of energy absorption by all surfaces quickly becomes equal to the rate of energy..

w j is the work done in the j th interval time; D w j = F ja D x Total work, W = D w j = F j a D x Geometrically, the work is equal to the area between the F(x) curve and the X-axis between the limits x i and x ..

Specific Heat - Two objects made of the same material, say marble, would have heat capacities proportional to their masses. It is therefore convenient to define a heat capacity per unit mass or specific heat that refers not to an object but to a unit mass of the material of the object. Equation (i)..

. If the intensity becomes too great, the sensation becomes one of pain rather than of hearing. This is indicated by the upper curve which lies close to 10 6 m Wm -2 or 1 Wm -2 , putting 1 = 1 Wm -2 and I 0 = 10 -12 Wm -2 in equation (1-35), we get = 10 log 10 12 = 120 dB A sound of intensity level..

Distance in km 0 10 20 30 40 50 60 Time 10.00am 10.15am 10.30am 10.45am 11.00am 11.15am 11.30am The above table tells us that the bus is covering equal distances in equal intervals of time i.e., the bus is moving with uniform speed. If the bus ..

The word 'Physics' comes from the Greek word 'phusis' meaning 'nature', introduced by the ancient scientist 'Aristotle'. Man has always been fascinated by nature. So, he questioned and sought answers for every phenomena nature could offer. The branch of science which is devoted to the st..

Physical World and Measurement - Humans have always been curious about the world around them. The world has an astonishing variety of materials and bewildering diversity of life and behaviour. The inquiring and imaginative human mind has responded to the wonder and awe of nature in differ..

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