PLEASE PLEASE HELP!!

A wave with a wavelength of 2 meters travels at 6 hz. What is its velocity?

3 m/s

4 m/s

8 m/s

12 m/s

One-hundred (100) wavelengths pass every 5 seconds. What is the frequency of the wave?

1 Hz

20 Hz

500 Hz

It cannot be determined.

Ineed the answer to question 1 , i’m desperate

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.