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Intensity

Polarization

Completely polarized light is passed through a polarizing sheet. The light that passes though has an intensity of 50% of the incident beam. The angle between the direction of the polarization of the incident beam and the direction of the polarization of the sheet must be what?

Point source of light

Consider a point source of light. How would the intensity of light vary with distance from the source according to a) wave theory and b) particle or photon theory? Explain.

How Sound Intensity Varies with Distance from the Source

A point source of sound that emits uniformly in all directions is located in the middle of a large, open field. The intensity at Brittany's location directly north of the source is twice that at Phillip's position due east of the source. What is the distance between Brittany and Phillip if Brittany is 10.0 m from the source?

Sound Intensity of Twenty Violins Playing Simultaneously

Twenty violins playing simultaneously with the same intensity combine to give an intensity level of 82.5 dB. (a) What is the intensity level of each violin? (b) If the number is increased to 40, will the combined intensity level be more than, less than, or equal to 165 dB? explain

Sound Intensity Relations

Sound 1 has an intensity of 380.0 W/m^2. Sound 2 has an intensity level that is 2.5 dB greater than the intensity level of sound 1. What is the intensity of sound 2?

Converging Lenses, Diffraction Grating, Reflection & Polarizing

See attachment for figures. 1) Two converging lenses with focal lengths of 40cm and 20cm are placed 10cm apart. A 2cm tall object is 15cm from the 40cm focal length lens. a) Use ray tracing to locate the image of the lens combination. b) Is the image real or virtual? Is it upright or inverted? c) Calculate the exact locati

Polarization of Light Waves

Unpolarized light passes through two polaroid sheets. The axis of the first is vertical, and that of the second is at 26.0° to the vertical. What fraction of the initial light is transmitted?

Intensity of Light and Distance from Source

The illumination, I in luxes of a surface d meters from a light source given by I=kd^(-2) where k is a constant based on the intensity of the light source. (a. Solve for k if we know that I = 750 luxes at a distance of 2 meters from the light source. k = 3000) This is the question I need help with!! B. IF OUR SOLAR POWER

Minimizing question

The illumination at a point is inversely proportional to the square of the distance of the point from the light source and directly proportional to the intensity of the light source. If two light sources are 30 feet apart and their intensities are 70 and 50 respectively, at what point will the sum of their illumination be minimu

Dependent and independent variables

Suppose you were interested in determining the effect of lighting on the morale of your employees. How would you go about obtaining data for your research? What would be your dependent and independent variables? How would you determine the ideal amount of lighting? Please use a real life situation, like an Insurance office

Radius of a concave mirror using the intensity of sunlight

The intensity of sunlight is 1.00 kW/m^2. A highly reflective concave mirror is pointed at the sun to produce a power of at least 350 W at the image. a) Find the radius r of the circular mirror. b) Suppose the light intensity is to be at least 120 kW/m^2. Find the relationship between r (the radius) and R (the curvature) of t