Visual photometry and solid angle, Physics

Assignment Help:

VISUAL PHOTOMETRY: The branch of science which deals with measurement of brightness or luminous intensities of light emitted by different sources using certain standards and techniques is called visual photometry.

SOLID ANGLE : The ratio of the area of the surface of the portion of a sphere enclosed by the conical surface forming the angle to the square of the radius of the sphere is called solid angle.

LUMEN: Lumen is the amount of light energy emitted per second by a uniform (point) source of one candela with in a cone of unit solid angle.

CANDELA: Candela is defined as the luminous flux emitted per unit solid angle along normal to the surface by one sixtieth (1/60) square cm area of a black body radiator (source) kept at the temperature of solidifying platinum (at 2046 K).


Related Discussions:- Visual photometry and solid angle

Explain steady state forced vibration, In steady state forced vibration, br...

In steady state forced vibration, briefly explain how the phase of driven system modifies with frequency of the driving force?

Determine average kinetic energy of each type of molecule, Determine the av...

Determine the average kinetic energy of each type of molecule? A cylinder contains a mixture of helium and argon gas in equilibrium at temperature of 149°C. (a) What is the a

NUCLEAR FISSION AND FUSION, what do you mean by nuclear fusion and fusion? ...

what do you mean by nuclear fusion and fusion? explain briefly giving certain examples.

Forces, like parallel forsces

like parallel forsces

Dteremine the Acceleration of the rocket , After being launched, a rocket a...

After being launched, a rocket attains a speed of 122 m/s before the fuel in the motor is completely used. If you suppose that the acceleration of the rocket is constant at 32.2 m/

Determine number of neutrons in nucleus of the atom, An atom has 26 electro...

An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be : (1) 26      (2) 30        (3) 36                     (

ELEMENTARY MECHANICS, Ask queA cart of weight 25 N is released at the top o...

Ask queA cart of weight 25 N is released at the top of an inclined plane of length 1m, which makes an angle of 30° with the ground. It rolls down the plane and hits another cart of

Define about the modified joule-thomson, Define about the Modified Joule-Th...

Define about the Modified Joule-Thomson? Container A of variable volume V controlled by a frictionless piston immersed in a bath at temperature T.  This container is connected

Evaluate the linear distance on the screen, Light from a monochromatic sour...

Light from a monochromatic source of wavelength 4000A 0 is incident on a grating having 5000 rulings / cm. The spectrum is focused on a screen by a lens of focal length

A simple wheel and axle, A simple wheel and axle Remove the cover from ...

A simple wheel and axle Remove the cover from a pencil sharpener and bind a string tightly around the end of the shaft. Bind a weight of various kilograms to the end of the str

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd