A incandescent lightbulb radiates of visible light uniformly in all directions. (a) Find the intensity of the light from the bulb at a distance of (b) If the average wavelength of the visible light is and counting only those photons in the visible spectrum, find the number of photons per second that strike a surface that has an area equal to is oriented so that the line to the bulb is perpendicular to the surface, and is a distance of from the bulb.
Physics 211 – Week 3 Vectors and Motion in Multiple Directions 1. Vectors a. Definition: any quantity with both direction and magnitude i. represented by arrow ii. Scalar quantity – only magnitude, no direction b. Displacement Vector – shows distance and direction of movement c. Vector addition i. s=a⃗+b⃗ ii. The head of b must be touching the tail of ⃗ . d. Vector subtraction s=⃗a+−b i. b ii. Reverse the direction of b (make sure the head of touches the tail of a
