MEDIUM
12th ICSE
IMPORTANT
Earn 100
In laboratory the Balmer series cannot be obtained in the absorption spectrum of the hydrogen atom, but it can be seen in the absorption spectrum of sun. Explain why?
Important Questions on Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom
MEDIUM
12th ICSE
IMPORTANT
On an energy level diagram of hydrogen atom; show by a downward or an upward arrows a transition responsible for emission lines of Balmer series.
MEDIUM
12th ICSE
IMPORTANT
On an energy level diagram of hydrogen atom; show by a downward or an upward arrows a transition responsible for emission lines of Lyman series.
MEDIUM
12th ICSE
IMPORTANT
On an energy level diagram of hydrogen atom; show by a downward or an upward arrows a transition responsible for absorption lines of Lyman series.
MEDIUM
12th ICSE
IMPORTANT
Is it essential that all the lines available in emission spectrum should be available in absorption spectrum also? Give reason.
MEDIUM
12th ICSE
IMPORTANT
How can the elements be identified by the study of line spectrum?
HARD
12th ICSE
IMPORTANT
The distance of closest approach depends upon the charge of the nucleus but not upon its mass, why?
HARD
12th ICSE
IMPORTANT
An -particle passing through a potential difference of volt strikes a nucleus. Prove that if the atomic number be , then the distance of the closest approach of the particle to the nucleus will be .
EASY
12th ICSE
IMPORTANT
Why is motion of planets around the sun not governed by Bohr's postulate of quantisation of angular momentum ?
