Which of the following statement(s) is/are INCORRECT ?

Options

A. All spectral belonging to Paschen series in `He^(+)` spectrum lie in visible region.
B. If ligbht of frequency `v` falls on a metal surface having work funcation `hv_(0)`, photoelectric effect can take place only if `v ge v_(0)`.
C. A metal with lesser work function produce more number of photoelectron if intensity and frequency of radiation is same as that for metal with more work function.
D. As temperature of a blackbody is increased the intensity at smaller increases and that at longer wavlength decreases.

Answer

A, C, D

Explanation

(A) Only first four spectral line belonging to Baimer series in hydrogen spectrum lie in visible riglon.
(B) If a light of frequency `v` falls on a meta,l surface having if `v ge ve`. Since `v_(0)` is the minimum frequency required for photoetectric effect.