How could you show that sound travels through water?

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer