Question-

Compute how thick an absorber requires to be to absorb 75% of the incoming light using the lambert-beer law for absorption. How is the little gain coefficient k of a laser defined in relation to the absorption coefficient α

Question-

Since even the nearest stars are trillions of miles away, if a radio message were sent to us by an extraterrestrial civilization, it would take _____years for it to travel from one of the nearest stars to Earth.

Question-

The termodynamic sound speed c is defined in sec.7.1. prove that : C = √(VCp/"MCvk" ) Where V is molar volume and M is molar mass . to what does this general result reduce for : (a) an ideal gas? (b) An incompressible liquid? What do these results suggest qualitatively about the speed of sound in liquids relative to gases?

Question-

A child bounces a 48 g superball on the sidewalk. The velocity alter of the superball is from 28 m/s downward to 17 m/s upward. If the contact time with the sidewalk is 1/800 s, define the magnitude of the average force exerted on the superball by the sidewalk?

Question-

Both car A and car B leave school when a clock reads zero. Car A travels at 75 km/h, though car B keeps its velocity 65 km/h. How far are the two cars from school when the clock reads 2 hours? Draw a position time graph showing the motion of both cars.

Question-

A roller coaster, shown in Fig. 6-38 (h1 = 45 m, h2 = 10 m, h3 = 22 m), is pulled up to point A where it and its screaming occupants are released from rest. Assuming no friction, compute the speed at points B, C and D.