2. Misturando-se 1 litro de água a 65ºC, 2 litros de água a 55ºC e 3 litros de água a 30ºC, obtemos 6 litros de água a: a) 30ºC
b) 35ºC
c) 40ºC
d) 50ºC
e) 65ºC

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.