The sound of a circular saw has a frequency of 100 Hz when being used in a garage where the air temperature is 20 °C. Calculate the wavelength of the sound waves produced by the circular saw.

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?