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in He–Ne lase...

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in He–Ne laser, metastable state exist in (1)He (2)Ne (3)both 1 and 2 (4) non

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Q. The condition for achieving laser action are
(i) the system must be in a state of population inversion
(ii) the excited state of the system should be in metastable state
(iii) the atom should be in lower energy state
(iv) no conditions required

Q. The life time of an excited state in case of metastable state is

Q. Non-metals exist in which state?

Q. Assertion :In He-Ne laser, population inversion takes place between energy levels of neon atoms. Reason: Helium atoms have a meta-stable energy level.

Q. A laser beam can be focussed on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of

1 n W

and its wavelength is

632.8 n m

.The intensity of foucussed beam will be

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