A light beam with the wavelength of 660 nm (AA) is created by a spaceship (A), is observed as its wavelength is 924 nm (Aobserved). Another spaceship (B) is observed by Earth as it is receding with the speed of 0.7c (VB.Earth). The angular distance between these two spaceship is 90 degrees for an observer at Earth. Find the speed of the spaceship B for an observer located at the spaceship A (VBa)- A 4 = 660nm VB,A = ? Aobserved = 924nm VB,Earth = 0.7c

A light beam with the wavelength of 660 nm (AA) is created by a spaceship (A), is observed as its wavelength is 924 nm (Aobserved). Another spaceship (B) is observed by Earth as it is receding with the speed of 0.7c (VB.Earth). The angular distance between these two spaceship is 90 degrees for an observer at Earth. Find the speed of the spaceship B for an observer located at the spaceship A (VBa)- A 4 = 660nm VB,A = ? Aobserved = 924nm VB,Earth = 0.7c