If the peak wavelength of a star at rest is 830 nm, but astronomers on earth observer that is has been shifted by 3.2 nm. Then how fast is the star moving relative to the earth

The speed is    

Explanation:

From the question we are told that

   The  peak wavelength is  

   The magnitude of the shift is  

Generally the doppler shift equation is mathematically represented as

=>  

Here c is the speed of light with value  

So

=>    

where's the following? you gotta add it to know what the choices are

explanation:

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.