The 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 , X B and X C respectively. Then,

Question

Philoid · Accepted Answer

Wavelength of source B is given as 555 nm. The highest luminosity is observed in source B only, because it increases from zero to 555 nm and then stars decreasing. The wavelength of source A is nearer to that of C. So, X_A is greater than X_C.

X_B > X_A, X_B > X_C

So, option C is correct.

X_B > X_A, X_B > X_C

So, option C is correct.

The 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 XA, XB and XC respectively. Then,

The 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, X_B and X_C respectively. Then,