What is the frequency of radiation whose wavelength is 0.86 nm,?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.