Assume that 2 xx 10^(-17) J of light energy is needed by the interior of the human eye to see an object. The number of photons of yellow light with lambda = 595.2nm are needed to generate this minimum energy is 12x. Then the value of x is _________ .

Assume that 2 xx 10^(-17) J of light energy is needed by the interior

1.	Assume that 2 xx 10^(-17) J of light energy is needed by the interior of the human eye to see an object. The number of photons of yellow light with lambda = 595.2nm are needed to generate this minimum energy is 12x. Then the value of x is _________ .
Answer» Solution :`E = n(hc)/(LAMBDA)` `implies(2xx 10^(-17))/(1.6 XX 10^(-19)) eV = n xx (1240)/(595.2) xx (eV. Nm)/(nm)` `impliesn = 60 implies 12 x = 60 implies x = 5`