question_answer

A screen receives 3 watt of radiant flux of wavelength 6000 Å. One lumen is equivalent to \[1.5\times {{10}^{-3}}watt\] of monochromatic light of wavelength 5550 Å. If relative luminosity for 6000 Å is 0.685 while that for 5550 Å is 1.00, then the luminous flux of the source is  

A)            \[4\times {{10}^{3}}lm\] 

B)            \[3\times {{10}^{3}}lm\]

C)            \[2\times {{10}^{3}}lm\] 

D)            \[1.37\times {{10}^{3}}lm\]