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

=>    

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

a. vertically

explanation:

i tried it and took the test

if im wrong then we have different tests