Structure of At...

Atomic radius is of the order of $$10^{-8}\ cm$$ and nuclear radius is of the order of $$10^{-13}\ cm$$. The fraction of atom occupied by nucleus is:

If the diameter of two different nuclei are in the ratio 1 : 2, then their mass number are in the ratio: 

Which series have highest energy in hydrogen spectrum?

The Vividh Bharati station of all india Radio, Delhi,broadcasts on a frequency of 1,368kHz (kilo hertz). Calculate the wavelength of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to ?

The electronic configuration, $$1s^22s^22p^63s^23p^63d^9$$, represents a:

For the electronic transition from $$n=2$$ to $$n= 1$$ which one of the following will produce the shortest wavelength?

In terms of Bohr radius $${a}_{0}$$, the radius of the second Bohr orbit of a hydrogen atom is given by:

If the ionisation energy of hydrogen is $$2.18\times { 10 }^{ -19 }\quad J$$, the first ionisation energy of $${ He }^{ + }$$ion is:

A certain electronic transition from an excited state to the ground state of the $$H$$ atom in one or more steps gives rise to four lines in the ultraviolet region of the spectrum, how many lines does this transition produce in the infrared region of the spectrum.

Which of the following orbitals are in the increasing order of energy.