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Thank you very much for all the explanations Lnewqban, Gavran, haruspex, Steve4Physics

Well, it doesn’t say the moth is flying directly towards the bat. Perhaps it was supposed to tell you it was flying at an angle of 60°...

Assuming that's not rhetorical... You can’t. But there’s a possibility that a 60° angle was accidentally omitted from the question -...

How can we get this information from the question?

Your solution is okay. You can check it at https://en.wikipedia.org/wiki/Doppler_effect#Radar.

You mean both bat and moth will detect frequency of 230.3 kHz?

I treat this question as two cases of Doppler effect. (1) When the sound wave travels from bat to moth Speed of sound = 222 x 1.5 =...

Thank you very much for all the help and explanation kuruman, jbriggs444, Lnewqban, Herman Trivilino, Gavran, haruspex

Yes it does and this holds in theory. There is not an idealized situation in theory when PB=0 and the syphon works...

At room temperature the saturated vapor pressure of water is about 3% of an atmosphere. Whether this counts as "approximately zero"...

https://en.wikipedia.org/wiki/Siphon#Maximum_height

Because molecules of the liquid will be jumping into the gas space as long as they have extra energy to do so. Those jumps will increase...

[Water] siphons stop working at about 0 C.

Because the reasons explained above, statement (i) is only approximately correct. Please, see...

At the maximum hight of the siphon, when cavitation occurs, the absolute pressure is not zero, It is equal to the vapor pressure of the...