Question

Three light sources A, B and C emit equal amount of radiant energy per unit time. The wavelengths emitted by the three sources are 450 nm, 555 nm and 700 nm respectively. The brightness sensed by an eye for the sources are X_A, X₅ and X_C, respectively. Then,

(a) X_A>X_B, XC> X_B

(b) X_A > X_B, X_B> X_C

(C) X_B> X_A,X_B > X_C

(d) X_B > X_A, X_C, > X_B.

Answer 1

(C) X_B> X_A,X_B > X_C