Sound . A. does not need a medium to travel B. is reflected when it bounces off a shiny surface
C. is created by electric and magnetic
D. fields moves in longitudinal waves​

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Why does a red shoe appear red in daylight

How does a hydroelectric power plant converts energy into energy.