A string, clamped at its ends, vibrates in three segments. The string is 100 cm long. The wavelength is:

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Could we see a galaxy that is 20 billion light-years away?

Is the number of complete movements of a wave per second.