A dog can hear sounds in the range from 15
to 50,000 Hz.
What wavelength corresponds to the upper
cut-off point of the sounds at 20◦C where the
sound speed is 344 m/s?
Answer in units of m.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

What causes the formation of ocean currents?