A metal is irradiated with a radiation of wavelength 300 nm. Then photo electrons found to have velocity of 3.7 xx 10^5 m/s. When a graph is drawn between K.E of photo electrons and frequency of radiation a straight line is obtained cutting X-axis. Difference between incident frequency and threshold frequency is

A metal is irradiated with a radiation of wavelength 300 nm. Then phot

1.	A metal is irradiated with a radiation of wavelength 300 nm. Then photo electrons found to have velocity of 3.7 xx 10^5 m/s. When a graph is drawn between K.E of photo electrons and frequency of radiation a straight line is obtained cutting X-axis. Difference between incident frequency and threshold frequency is
Answer» `9.4xx10^(13)` Hz `8.5xx10^(22)` Hz `9.4xx10^(12)` Hz `8.4xx10^(10) Hz` Solution :`upsilon - upsilon_0 =(6.625xx10^(-19))/(6.625xx10^(13)) -9.09 XX 10^(14)` `=9.4xx10^(23) Hz`