Consider a 100-W incandescent light bulb that emits light uniformly in all directions. Part A) What pressure does the light emitted by this bulb exert on a mirror at a distance of r if Pv of the power is emitted as visible light?

A concave mirror has a focal length of 15 cm. What is the magnification if the object's distance is 105 cm?A healthy person has a body temperature of 98.6 oF. Use the properties of blackbody radiation to work out the precise wavelength of the peak radiation. (Hint: Convert Fahrenheit degrees into Kelvin (absolute) degrees.)

How thick is a layer of oil floating on a 52cm bucket of water. You measure your laser beam to take 2.33 ns going straight through the layers

Humans are unable to convert radiant energy from the sun into stored energy that can be usedto do work. Plants, however, obtain their energy from photosynthesis – sunlight is used toconvert carbon dioxide and water into sugars (stored as an energy source) and oxygen.Consider a leaf with a surface area of 2.5 cm2. On a sunny day it might receive sunlight withan average power per unit area of 350 W/m2. Of this incident light, only about 40% is usefulfor photosynthesis. (a) If the process was perfectly efficient (i.e. all the useful radiation was converted tostored internal energy), calculate the increase in internal energy of the leaf in aperiod of one hour. (b) In practice, the overall efficiency of the process (percentage of energy storedrelative to the total incident energy reaching the surface of the leaf) is only about6%. Discuss, in relation to the First Law of Thermodynamics, what happens to theremaining energy?