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. The value of X-intercept

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. The value of X-intercept
Answer» `9XX10^4 `Hz `10.2xx10^5` Hz `8.6xx10^5` Hz `9xx10^(14)` Hz Solution :`E = (hc)/(lambda) = 6.625 xx 10^(-19) J , KE =6.23xx10^(-20)J` W`= E- KE= 6.002 xx 10^(-19)` `hv_0 = 6.002xx10^(-19) impliesv_0 = 9.09xx10^(14) Hz`