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Chromium has mono atomic body-centred cubic structure. Its cell edge is 300 pm, what is its density? (Molar mass of Cr = 52 g mol - 1 , Avogadro number N = 6.023 x 10 2 3 mol..

01. A body of mass 2kg is raised to a height of 25m. Calculate the potential energy possessed by the body. Solution: Mass of the body (m) = 2kg Height (h) = 25 m Potential energy of the body = mgh 02. A bag of rice weighs 75kg. To what height is it raised if the work done in lifting it is 4900 J. S..

01. An object of mass 5 kg is lifted up through a distance of 2 meter. What is the work done? Solution: W = F x s Also, force acting on the object is F = mg [Newton's second law of motion] Mass of the object (m) = 5 kg Distance moved = 2m Therefore, Work done = F x s 02. How much work ..

01. The Earth's gravitational force causes an acceleration of 5 m/s 2 in a 1 kg mass somewhere in space. How much will the acceleration of a 3 kg mass be at the same pla..

01. A body of mass 2 kg is raised to a height of 25 m. Calculate the potential energy possessed by the bo..

01. An object of mass 5 kg is lifted up through a distance of 2 metre. What is the work don..

Determine the radius of the first orbit of the hydrogen atom. What would be the velocity and frequency of the electron in the first orbit? Given: h = 6.62 x 10 - 3 4 Js, m = 9.1 x 10 - 3 1 kg, e = 1.6 x 10 - 1 9 C, k = 9 x 10 9 N m 2 C - 2..

Calculate the ionisation potential for a lithium at..

Using the Rydberg formula, calculate the wavelengths of the first four spectral lines in the Balmer series of the hydrogen spectru..

A nucleus of UX 1 has a half life of 24.1 days. How long a sample of UX 1 will take to change 90% of it to UX 2..