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

Algebraic physics question older railroad tracks in the usa

Algebraic Physics Question: Older railroad tracks in the USA are made of 12 meter long pieces of steel. When the tracks are laid, gaps are left between the sections to prevent buckling when the steel thermally expands. I ...

A particle moves in the xy plane under the constraint that

A particle moves in the xy plane under the constraint that its velocity vector is always directed toward a point on the x axis whose abscissa is some given function of time f(t). Show that for f(t) differentiable, but ot ...

Question 1nbsp the area of the earths surface is

Question 1:  The area of the Earth's surface is approximately 516 X 10 6  km 2 .  What is the weight of the entire atmosphere in tonnes?  Express your answer using scientific notation, in units of 10 12  tonnes. Answer: ...

A monochromatic light is incident on a single slit of width

A monochromatic light is incident on a single slit of width 0.800 mm, and a diffraction pattern is formed at a screen that is 0.800 m away from the slit. The second-order bright fringe is at a distance 1.60 mm from the c ...

An elite tour de france cycler can maintain an output power

An elite Tour de France cycler can maintain an output power of 450 W during a sustained climb. At this output power, how long would it take an 85 kg cycler (including the mass of the bike) to climb the 1100 meter high Al ...

The yield y of an apple orchard in bushels as a function

The yield, Y , of an apple orchard (in bushels) as a function of the amount, a, of fertilizer (in pounds) used on the orchard is shown in Figure 1.100. (a) Describe the effect of the amount of fertilizer on the yield of ...

1 water in a container is originally at 100 kpa the water

1. Water in a container is originally at 100 kPa. The water is subjected to a pressure of 120 MPa. Determine the percentage decrease in its volume. 2. Determine the height to which water at 68°C will rise in a clean capi ...

Particle track detectors are used to measure the speed of

Particle track detectors are used to measure the speed of particles if the lifetime of the particle is known. Particle X has a lifetime of 256.2 ps. These particles are created in an experiment inside the detector by a g ...

Question a wave pulse travels along a string at a speed of

Question: A wave pulse travels along a string at a speed of 200 cm/s. What will the speed be if: 1. The string's tension is doubled. 2. The string's mass is quadrupled (but its length is unchanged). 3. The string's lengt ...

If a circuit requires a capacitor to give good coupling at

If a circuit requires a capacitor to give good coupling at 200Hz and the resistance the capacitor is connected to is 3Kohms, what value capacitor is needed?

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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