the unit for measuring the rate at which light energy is radiated from a source is the?

Question

angstrom, candela, lumen, lux.

Answer 1

candela

Answer 2

One lux equals one lumen per square metre. 4π lumens is the total luminous flux of a light source of one candela of luminous intensity.

The lumen is a measure of the total "amount" of visible light emitted by the source. How much light.

The candela is the luminous intensity, in a given direction, of a source. How bright is it.

So lux is the correct answer, as it measures the total amount of light over an area.

Answer 3

Candela



A lumen is the flux of a candela passing through a solid angle of one steradian.

Answer 4

Lumen

Answer 5

mild intensity The technology of measuring mild is named photometry. the three portions in many instances measured are the luminous intensity of a resource of sunshine; the luminous flux, or the linked fee at which mild power is radiated from a resource; and the illuminance of a floor. application of the strategies of photometry could be efficient in identifying on the main suitable sort, variety, and places of lamps in a proposed installing. The luminous intensity of a particular resource of sunshine is measured via evaluating it with the intensity of yet another resource of sunshine that’s chosen as a established. because of the fact wax candles have been the main undemanding assets of guy-made mild while the learn of photometry grew to become into in its early ranges, a candle of special dimensions and high quality grew to become into chosen because of the fact the established. (in particular, a whale oil candle burning on the linked fee of seven.776 grams in keeping with hour grew to become into the established.) The SI metric unit of luminous intensity is the candela. The candela (abbreviated cd) is defined because of the fact the luminous intensity, in a given direction, of a floor that emits monochromatic radiation of frequency 540  1012 hertz. an hassle-free one hundred-watt mild bulb has an intensity of roughly a hundred thirty cd. the linked fee at which mild power is radiated from a resource of sunshine is named the luminous flux, and the unit of luminous flux is the lumen. as an occasion, assume that a candle with a mild intensity of a million candela on the tip of the flame is placed interior the midsection of a hollow sphere with a radius of a million meter. It’s assumed that the intensity of the resource is the comparable in all guidelines. as a result, mild power is radiated to each and each element of the interior floor of the sector on the comparable fee. The luminous flux on any element of this floor with an area of a million sq. meter is a million lumen.