Let some star experience periodic surface pulsation at a practically constant temperature (i.e., at a constant brightness per unit

Let some star experience periodic surface pulsation at a practically constant temperature (i.e., at a constant brightness per unit surface of the star). With pulsation, the radii of the star in the extreme positions are in the ratio of 1: 2. What is the amplitude of the change in the total brightness of a star in magnitude?

The amplitude of the change in brightness corresponds to a change in the surface, i.e., a change in the square of the radius, since the star is a ball. The brightness changes, therefore, by a factor of 4 and the amplitude is 2.5 lg4 = 1.5 stars. magnitudes.

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.