1.

Which of the following statements is/are INCORRECT :

Answer»

All spectral lines BELONGING to Balmer series in hydrogen spectrum lie in visible region
if a light of frequency V FALLS on a METAL surface having work function hv, PHOTOELECTRIC effect will take place only if `v le v_0`
The number of photoelectrons ejected from a metal surface in photoelectric effect depends upon the intensity of incident radiations.
The series limit wavelength of Balmer series for H-atom is `4/R`, where R is Rydberg's constant.

Solution :(A)Only first four spectral lines belonging to Balmer series in hydrogen spectrum lie in visible region.
(B) If a light of frequency v falls on a metal surface having work functional hv, photoelectric effect will take place only if `vgev_0`,since `v_0` is the minimum frequency required for photoelectric effect.


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