steradian वाक्य
उदाहरण वाक्य
मोबाइल
- The then-conventional use of a single detector rotated about an illuminated sample with intensities collected at specific angles was called " differential light scattering " after the quantum mechanical term " differential cross section ", " ? ( ? ) " expressed in milli-barns / steradian.
- The steradian, like the radian, is a dimensionless unit, essentially because a solid angle is the ratio between the area subtended and the square of its distance from the vertex : both the numerator and denominator of this ratio have dimension length squared ( i . e . L / L = 1, dimensionless ).
- However, I have a question : in the example of the sphere, shouldn't radiation be reflected over just less than 2 \ pi steradians ( instead of 4 \ pi ), because only half of the sphere is facing the radar emitter ?-- Bowlhover 01 : 21, 18 September 2006 ( UTC)
- The entire sky is 4? steradians, or 4? ?( 180 / ? ) ?H " 41, 253.0 square degrees, of which about 30, 000 square degrees are visible from Hawaii, which means that the entire sky can be imaged in a period of 40 hours ( or about 10 hours per night on four days ).
- The lumen is defined as amount of light given into one steradian by a point source of one candela strength; while the candela, a base SI unit, is defined as the luminous intensity of a source of monochromatic radiation, of frequency 540 terahertz, and a radiant intensity of 1 / 683 watts per steradian . ( 540 THz corresponds to about 555 nanometres, the wavelength, in the green, to which the human eye is most sensitive.
- The lumen is defined as amount of light given into one steradian by a point source of one candela strength; while the candela, a base SI unit, is defined as the luminous intensity of a source of monochromatic radiation, of frequency 540 terahertz, and a radiant intensity of 1 / 683 watts per steradian . ( 540 THz corresponds to about 555 nanometres, the wavelength, in the green, to which the human eye is most sensitive.
- Such detectors are called " seals; the name " 4? detector " comes from the fact that such detectors are designed to cover nearly all of the 4? steradians of solid angle around the interaction point; in terms of the standard coordinate system used in collider physics, this is equivalent to coverage of the entire range of azimuthal angle (-\ pi \ leq \ phi \ leq \ pi ) and pseudorapidity ( | \ eta | \ geq 0 ).
- Dividing the irradiance of 1050 W / m 2 by the size of the sun's disk in steradians gives an average radiance of 15.4 MW per square metre per steradian . ( However, the radiance at the centre of the sun's disk is somewhat higher than the average over the whole disk due to limb darkening . ) Multiplying this by ? gives an upper limit to the irradiance which can be focused on a surface using mirrors : 48.5 MW / m 2.
- Dividing the irradiance of 1050 W / m 2 by the size of the sun's disk in steradians gives an average radiance of 15.4 MW per square metre per steradian . ( However, the radiance at the centre of the sun's disk is somewhat higher than the average over the whole disk due to limb darkening . ) Multiplying this by ? gives an upper limit to the irradiance which can be focused on a surface using mirrors : 48.5 MW / m 2.
- In terms of total absolute power sensitivity, Denton and Pirenne in the Journal of Physiology in 1954 found that for diffuse, extended sources i . e . a relatively large ( ~ 45 degree wide source, as viewed by the subject ) frosted glass aperture, and a long ( 5 second ) observation and decision time, the human eye could begin to reliably distinguish the lit from unlit glass at a power level of approximately 7.6 x 10 " 14 watts / steradian-cm 2 at the eye for green ( 510 nm ) light.
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