Atoms Test - 15...

On decreasing principal quantum number $$n$$, the value of $$r$$ will :

The incident photon involved in the photo-electric effect experiment ($$\nu > \nu_o$$)

A strong argument for particle nature of cathode rays is that they

The radius of first Bohr orbit in hydrogen atom is $$r_{0}$$ then the radius of first orbit in helium atom will be

Cathode rays have velocities

In a Rutherford scattering experiment when a projectile of charge $$Z_1$$ and mass $$M_1$$ approaches a target nucleus of charge $$Z_2$$ and mass $$M_2$$, the distance of closest approach is $$r_0$$. The energy of the projectile is :

The number of different wavelengths that is possible to be observed in the spectrum from a hydrogen sample if the atoms are excited to third excited state is:

The angular momentum of an electron in hydrogen atom is proportional to

Photon is a

If the K.E. of a cathode ray beam is 8KeV, then the tube should work at a Potential Difference of