In the spectrum of the star in the constellation Draco, the hydrogen line Ha is visible at a wavelength of 656.00 nm.

In the spectrum of the star in the constellation Draco, the hydrogen line Ha is visible at a wavelength of 656.00 nm. What is the radial velocity of the star? The laboratory wavelength H is 656.28 nm.

Approximately -128 km / s (the star is approaching us).

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.