Physics

posted by .

A 100 watt bulb emits light in all directions. The distance R from the bulb is equal to 1.0 meter.

Complete the table below with calculated values of intensity of the bulb.



Distance from Source Intensity (W/m2)
R ?

2R ?

3R ?


c) If the bulb was replaced by a 75 watt bulb, at position 2R the intensity would be?

  • Physics -

    this is really nonsense. 100 watt light bulbs do not radiate 100 watts of luminous energy. So using the inverse square law is silly, at best.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A light bulb is wired in series with a 133-Ω resistor, and they are connected across a 120-V source. The power delivered to the light bulb is 22.5 W. What are the two possible resistances of the light bulb?
  2. Physics

    A 100.0 W light bulb hangs from the ceiling. What is the visible light intensity on the floor, 2.1 m directly below the bulb, if 10% of its output is visible light?
  3. physics

    You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 1/2 A of current through the light bulb and 5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 2.5 W. …
  4. college physics

    You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 0.75 A of current through the light bulb and 7.5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 5.625 …
  5. Math

    By what percent is a 100-watt light bulb brighter than a 60-watt light bulb?
  6. Physics/Algebra

    Physics: For a 225-watt bulb, the intensity I of light in lumens at a distance of x feet is I=225/x^2. a. What is the intensity of light 5 ft from the bulb?
  7. algebra

    The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the distance …
  8. math

    The intensity of I of light from a light bulb, measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb. Suppose I is 85 w/m^2 when the distance is 5m. Find the intensity when …
  9. Math

    the intensity l of light from a light bulb, measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb. Suppose l is 70 w/m^2 when the distance is 5m. Find the intensity when the …
  10. College Algebra

    Intensity of Light. The intensity I of light from a light bulb varies inversely as the square of the distance d from the bulb. Suppose that I is 90 W / m 2 90W/m2 (watts per square meter) when the distance is 5 m. How much farther …

More Similar Questions