2 algebra based physics questions about waves/sound waves?

Posted on 2016-11-24 18:22:00 in Physics by STIPHEN

1) An ambulance is moving away from a stationary car stopped at an intersection. The siren emits as 618-Hz sound but that driver hears a 598-Hz sound. 

What is the speed of the ambulance? 
a) Less than 8 m/s 
b) Between 10 m/s and 12 m/s 
c) Between 12 m/s and 14 m/s 
d) Between 14 m/s and 16 m/s 
e) More than 16 m/s 

2) A sound wave with a length of 36 cm propagates in a tank filled with freshwater. A sound wave with the same frequency as the previous one propagates in a tank filled with ethyl alcohol. (Assume temperature of both tanks to be 20 degrees celsius) 
What is the wavelength of the sound in the alcohol filled tank? 
a) Less than 20 cm 
b) Between 20 cm and 30 cm 
c) Between 30 cm and 40 cm 
d) Between 40 cm and 50 cm 
e) More than 50 cm

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