Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Physics Expert

Answer the following problems.

problem 1)a) Define and describe the terms:

i) Luminance.

ii) Illuminance.

b) Two isotropic point sources A and B are suspended at a height of 3m and 4m respectively above horizontal working plane. The luminous intensities are 1800Cd and 2000Cd respectively. What should be the distance between the lamps, so that the illuminance at point on the working plane directly below A is 75lux more than at the point directly below B?

c) Describe the terms Photopic, Scotopic and Mesopic visions in terms of lighting levels and photoreceptors. Draw appropriate sketches.

problem 2)a) What is incandescence? What is the importance of selecting tungsten as the filament material for incandescent lamps?

b) What do you mean by refraction? How is it significant for lighting applications?

c) What do you mean by thermal radiators? Draw the energy distribution curve of a black body radiator and describe it.

problem 3)a) Describe the halogen regenerative cycle? Mention the advantages of tungsten halogen lamps as compared to GLS incandescent lamps.

b) Describe the classification of luminaries with regards to symmetry of light distribution.

problem 4) Describe with neat sketches, the four basic techniques used for the measurement of photometric characteristics of a luminaire using Gonio photometer?

Physics, Academics

  • Category:- Physics
  • Reference No.:- M96295

Have any Question? 


Related Questions in Physics

Meteorologists define the temperature lapse rate to be -dt

Meteorologists define the temperature lapse rate to be -dT /dz where T is the air temperature in Celsius at altitude z kilometers above the ground. (a) What are the units of the lapse rate? (b) What is the practical mean ...

Choose two of the following questions to respond to you

Choose two of the following questions to respond to. You should make sure to let us know which question you are responding to. Respond to the questions you choose as thoughtfully and thoroughly as possible, drawing from ...

Imagine fitting a mixture of ten gaussians to data in a

Imagine fitting a mixture of ten Gaussians to data in a twenty-dimensional space. Estimate the computational cost of implementing inferences for this model by enumeration of a grid of parameter values.

The four doors problema new game show uses rules similar to

The four doors problem A new game show uses rules similar to those of the three doors but there are four doors, and the host explains: ‘First you will point to one of the doors, and then I will open one of the other door ...

In problem above find the depth at which the net force on

In Problem above, find the depth at which the net force on the tank is zero. Problem:- On a certain day the barometric pressure at sea level is 30.1 in. Hg, and the temperature is 708F. The pressure gage in an airplane i ...

A cannon fires a shell straight upward 19 s after it is

A cannon fires a shell straight upward; 1.9 s after it is launched, the shell is moving upward with a speed of 16 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch ...

Find the most probable code word in the case where the

Find the most probable code word in the case where the normalized likelihood is (0.2, 0.2, 0.9, 0.2, 0.2, 0.2, 0.2). Also find or estimate the marginal posterior probability for each of the seven bits, and give the bit-b ...

A 198-cm by 158-cm rectangular coil has 276 turns the coil

A 1.98-cm by 1.58-cm rectangular coil has 276 turns. The coil rotates at 66rev/s in a magnetic field. If the maximum emf generated by the coil is 25V, what is the magnitude of the magnetic field?

1 find the equations of the tangent lines at x 2 to the

1. Find the equations of the tangent lines at x = 2 to the ellipse 2. Find the equation of the tangent line to the curve y = x 2 at x = 1. Show that this line is also a tangent to a circle centered at (8, 0) and find the ...

1 find the equations of the tangent lines at x 2 to the

1. Find the equations of the tangent lines at x = 2 to the ellipse 2. Find the equation of the tangent line to the curve y = x 2 at x = 1. Show that this line is also a tangent to a circle centered at (8, 0) and find the ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen