13. A burglar alarm is wailing with a frequency of 1200. hertz. What
frequency does a cop hear who is driving towards the alarm at a speed of
40.0 m/s? The air temperature is 35.0 oC.

Frequency heard by the police is 1336 Hz

Explanation:

As we know that the speed of sound in air is given as

now we know that

t = 35 degree C

so we have

now we know that if source and observer moves relative to each other then the observed frequency by the observer is given as

12000j is work done

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods