Atoms Test - 58...

The anode voltage of a photocell is kept fixed. The wavelength (i) of light falling on the cathode is gradually changed. The plate current (I) of the photocell varies as 

The shortest wavelength in the Lyman series of hydrogen spectrum is 912 A corresponding to a photon energy of 13.6 eV. The shortest wavelength in the Balmer series is:

Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is:

From lyman series of Pfund series, frequency__________

The energy of electron in the excited state of hydrogen atom is $$-0.85 eV$$. If 'h' is Plank's constant, the angular momentum of electron in the excited state is :

Two monochromatic light sources, $$A$$ and $$B$$, emit the same number of photons per second. The wavelength of $$A$$ is $${\lambda}_{A}=400nm$$ and that $$B$$ is $${\lambda}_{B}=600nm$$. The power radiated by source $$B$$ is

In hydrogen atom, an electron makes transition from $$n=3$$ to $$n=2$$ state in time interval of $$1.2\times{10}^{-8}s$$. Calculate the average torque (in Nm) acting on the electron during this transition.

In the following transitions, which one has higher frequency?

In which of the following system will the radius of the $$2^{nd}$$ orbit be minimum? 

Suppose an electron is attracted towards the origin by a force $$\dfrac { k }{ r } $$ where 'k' is a constant and 'y' is the distance of the electron form the origin. By applying Bohr model to this system, the radius of the nth orbital of the electron is found to be 'r$$_{ n }$$' and the kinetic energy of the electron to be 'T$$_{ n }$$'. Then which of the following is true ?