Atoms Test - 38...

An element X has number of protons = 4. What will be its mass number if it has 3 neutrons?

The radius of hydrogen atom in the first excited level is

Fraunh offer line of the solar system is an example of:

In a hydrogen atom, the electron is making $$6.6\times 10^{15} revs^{-1}$$ around the nucleus in an orbit of radius $$0.528 \overset{o}{A}$$. The magnetic moment $$(A-m^2)$$ will be.

If an electron is revolving around the hydrogen nucleus at a distance of $$0.1$$nm, what should be its speed?

Which of the following is not an inherent property of the photons?

The angular speed $$(\omega)$$ of an electron revolving in $$n^{th}$$ Bohr orbit and corresponding principal quantum number(n) are related as ____________.

If a cathode ray tube has a potential difference $$V$$ volt between the cathode and anode, then the speed $$v$$ of cathode rays is given by:

For the Paschen series the values of $${ n }_{ 1 }$$ and $${ n }_{ 2 }$$ in the expression $$\Delta E=Rhc\left( \dfrac { 1 }{ { n }_{ 1 }^{ 2 } } -\dfrac { 1 }{ { n }_{ 2 }^{ 2 } }  \right) $$ are

The spectrum obtained from the chromosphere of the sun at the time of total solar eclipse is :