Atoms Test - 72...

The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is (in m)

In a hydrogen atom, electron revolves in a circular orbit of radius $$0.53\overset {\circ}{A}$$ with a velocity of $$2.2\times 10^{6} ms^{-1}$$. If the mass of electron is $$9.0\times 10^{-31} kg$$, find its angular momentum.

According to Bohr's theory of hydrogen atom, the speed of the electron, its energy and the radius of its orbit varies with the principal quantum number $$n$$, respectively as:

Taking the Bohr radius as $$a_{0}=35pm$$, the radius of $$Li^{++}$$ion in its ground state, on the basis of Bohr's model, will be about

An ionic atom equivalent to hydrogen atom has wavelength equal to $$\dfrac{1}{4}$$ of the wavelengths of hydrogen lines. The ion will be

The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of $$108.5nm$$. the ground state energy of an electron of this ion will be

The electron in a hydrogen atom makes a transition $${n}_{1}\rightarrow {n}_{2}$$ whose $${n}_{1}$$ and $${n}_{2}$$ are the principal quantum numbers of the two states. Assume the Bohr model to be valid. The frequency of orbital motion of the electron in the initial state is $$1/27$$ of that in the final state. The possible values of $${n}_{1}$$ and $${n}_{2}$$ are

If the kinetic energy of an electron in the first orbit of $$H$$ atom is $$13.6 eV$$. Then the total energy of an electron in the second orbit of $${He}^{+}$$ is:

Which of the following weighs the least? 

The first line of Balmer series has wavelength $$6563\mathring {A}$$. what will be the wavelength of the first memeber of lymais series.