How do you calculate wavelength with distance? i know that it's 4l for the first harmonic of a closed end column but what is it for an open ended column or a column with one end open, one end closed? why does it work like that?

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.

If frequency goes up, what happens to wavelength? does it get shorter or longer?