Atoms Test - 25...

When the particle and its anti-particle unite, the result is

In the Geiger-Marsden experiment, the force that scatters particles is 

The force experienced by the cathode rays when they pass through a uniform electric field of intensity $$\bar{E}$$ is:

Cathode rays are made to pass between the poles of a magnet as shown in figure. The effect of magnetic field is

The angular momentum of the $$\alpha -$$particles which are scattered through large angles by the heavier nuclei, is conserved because

An electron makes transition from $$n= 3 , n=1$$ state in a hydrogen atom. The different possible number of photons that can be emitted is :

In the lowest energy level of hydrogen atom, electron has an angular momentum equal to:

The ionization energy of a hydrogen-like ion $$A$$ is greater than that of another hydrogen-like ion $$B$$. Let $$u$$ and $$E$$ represent the speed of the electron and energy of the atom respectively in the ground state. Then, 

In Rutherford's experiment the number of $$\alpha$$ particles scattered through an angle $$60^o$$ is $$112$$ per minute, then the number of $$\alpha$$ particles scattered through an angle of $$90^{0}$$ per minute by the same nucleus is:

The radius of hydrogen atom, when it is in its second excited state ,becomes $$\underline{\hspace{0.5in}}$$ its ground state radius.