From my research, the question has the following choices:
a.the lowest frequency at which a standing wave is possible
b. the highest frequency at which s standing wave is possiblec. the only frequency at which a standing wave is possible
d. the only frequency at which standing wave is not possible
From there, the correct answer is A.
Answer:

Explanation:
An adiabatic compressor is modelled as follows by using the First Law of Thermodynamics:

The power consumed by the compressor can be calculated by the following expression:

Let consider that air behaves ideally. The density of air at inlet is:





The mass flow through compressor is:



The work input is:


Answer:
m = 1.531kg
Explanation:
F = mg
m = F/g
m = 15/9.8 = 1.531kg (Approximately)
There is a horizontal abduction and horizontal adduction in the
transverse plane that is imaginary bisector that divides the body into two halves
upper or top and lower or bottom halves.
<span>Horizontal abduction involves the movement of the arm or thigh from
a medial or anterior position to a lateral position and in horizontal
adduction, the movement is reverse that is from lateral position to anterior
position.</span>