Q. The light coming from stars gives the idea of their ________ 

Explanation by: Mr. Dubey

The color and spectrum of starlight provide information about a star’s temperature.

Hot stars emit more blue light.

Cooler stars emit more red light.

The Wien’s displacement law helps determine a star's temperature based on its peak wavelength of emitted light.


Other options:

(A) Size → Determined using luminosity and distance.

(B) Rotational speed → Determined using Doppler shift in spectral lines.

(C) Mass → Determined using gravitational effects in binary star systems.