What is the luminous flux of a source emitting radio waves ?

Find the luminous flux of 10 W source of 600 nm. The relative luminosity at 600 nm is 0.6.

A point source emitting uniformly in all directions is placed above a table top at a distance of 0.50 m from it. The luminous flux of the source is 500 lumen. Find the illuminance at a small surface area of the table to a.directly below the source and b. at as distance of 0.80 m from the source.

What is the application of resonance in radio sets?

a. If the fundamental source wave is a vibrating object, what is the fundamental source of an electromagnetic wave ? b. Give the expression for velocity of E.M waves in vacuum. c. On what factors does its velocity in vaccum depend ?

What are Luminous objects?

What are Luminous objects?

A circular area of radius 1.0 cm is placed at a distance of 2.0 m from a point source. The source emits light uniformly in al directions. The line joining the source to the center of the area is normal to the area. It is found that 2.0xx1^-3 lumen of luminous flux is incident on the area. Calculate the total luminous flux emitted by the source and the luminous intensity of the source along the axis of the area.

The luminous intensity of a small plane source of light along the forward normal is 160 candela. Assume the source to be perfectly diffused, find the luminous flux emitted into a cone of solid angle 0.02 sr around a line making an angle of 60^@ with the forward normal.

What is the SI unit of Luminous Intensity?