Radio waves transmitted through space at 3.00 ✕ 108 m/s by the Voyager spacecraft have a wavelength of 0.137 m. What is their frequency (in Hz)?

Frequency,

Explanation:

We have,

Speed of radio waves is

Wavelength of radio waves is

It is required to find the frequency of the radio waves. The speed of a wave is given by :

So, the frequency of the radio wave is .

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.