Fill in blank without a word bank (unit is wave nature of light) 1. as water waves travels through a slit barrier, they bend and spread out. this is known as 2. two identical waves will interfere destructively, cancelling one another out, when one lags behind the other by a minimum of wavelength 3. a line along which crests consistently meet crests and troughs constantly meet troughs is called a(n) line 4. for two points sources vibrating in phase producing an interference pattern, the line along the central bisector is a(n) line

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.