The period of an ocean wave is 4 seconds. what is the waves frequency?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

Atomic nuclei of almost all elements consist of

Which sound characteristic is not affected by the relative motion of an object