Threshold frequency for a metal is `10^(15) Hz`. Light of `lambda = 4000 Å` falls on its surface . Which of the following statements is correct ?

The threshold frequency for a metal is 10^(15) Hz. When light of wavelenght 4000 Å is made incident on it, then

The threshold frequency for a certain metal is 3.3 xx 10^(14) Hz. If light of frequency 8.2 xx 10^(14) Hz is incident on the metal, predict the cut - off voltage for the photoelectric emission.

The threshold frequency for a certain metal is 3.3 xx 10^(14) Hz . If light of frequency 8.2 xx 10^(14) Hz is incident on the metal, predict the cutoff voltage for the photoelectric emission.

The threshold frequency for a certain metal is 3.3 xx 10^(14) Hz . If light of frequency 8.2 xx 10^(14) Hz is incident on the metal, predict the cutoff voltage for the photoelectric emission.

The threshold frequency for a certain metal is 3.3xx10^(14) Hz.If light of frequency 8.2xx10^(14) Hz is incident on the metal ,predict the cutoff voltage for the photoelectric emission.