The relative luminosity of wavelength 600 ,nm | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The brightness sensation is proportional to the luminous flux.Luminous flux is given by the product of radiant flux and relative luminosity.The re

Vedclass · Accepted Answer

$200$

Vedclass · Answer

(D) The brightness sensation is proportional to the luminous flux.Luminous flux is given by the product of radiant flux and relative luminosity.The relative luminosity at $555 \,nm$ is $1.0$ (peak sensitivity).Let $P_1 = 120 \,W$ be the radiant flux at $\lambda_1 = 555 \,nm$ and $L_1 = 1.0$ be its relative luminosity.Let $P_2$ be the radiant flux at $\lambda_2 = 600 \,nm$ and $L_2 = 0.6$ be its relative luminosity.For the same brightness sensation,the luminous flux must be equal:$P_1 	imes L_1 = P_2 	imes L_2$$120 	imes 1.0 = P_2 	imes 0.6$$P_2 = \frac{120}{0.6} = 200 \,W$.

The relative luminosity of wavelength $600 \,nm$ is $0.6$. Find the radiant flux of $600 \,nm$ needed to produce the same brightness sensation as produced by $120 \,W$ of radiant flux at $555 \,nm$.

Similar Questions

The radius of the central zone of a circular zone plate is $2.3\,mm$. The wavelength of the incident light is $5893\,\mathring{A}$. The source is at a distance of $6\,m$. What is the distance of the first image in meters?

The maximum illumination on a screen at a distance of $2\, m$ from a lamp is $25\, lux.$ The value of total luminous flux emitted by the lamp is

Fraunhofer lines are obtained in

$A$ leaf which contains only green pigments is illuminated by a laser light of wavelength $0.6328 \,\mu m$. It would appear to be

Which of the following phenomena support the wave theory of light?
$(1)$ Scattering
$(2)$ Interference
$(3)$ Diffraction
$(4)$ Velocity of light in a denser medium is less than the velocity of light in a rarer medium

Vedclass Test Series

Exam Paper Generator

Online Exam Module