The table below shows four wave sources. Green laser
Tuning fork
UV lamp
Megaphone
The waves enter the testing box through the opening. Inside the testing box are three sections. The air and water sections are separated by a transparent glass
pane. The water section and the vacuum chamber are separated by a transparent plastic pane. Which sources will be detected?

The air that we breath is made mostly of which gaseous molecule

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?