Star A is father than star B. Which satr will have a large parallax angle?

Star A is father than star B. Which star will have a large parallax angle?

Which is the star nearest to us ?

Questions based on diagram : The figure below shows forces acting on a star : What will happen if quantity represented by outward arrow is mor than quantity represented by inward arrow ?:

The polarising angle of glass is 57^(@) . A ray of light which is incident at this light which is incident at this angle will have an angle of refraction as

A ray of light travelling in water is incident on its open surface in air. The angle of incidence is theta^@ , which is less than the critical angle. Then there will be

A ray of light travelling in water is incident on its surface open to air. The angle of incidence is theta , which is less than the critical angle. Then there will be

A star radiates maximum radiation at wavelength lamda_m at temperature T. What will be the temperture of another star which radiates maximum energy of wavelength 2lamda_m ?

Answer the following : Consider two identical boxes . Suppose box A is completely filled with material of white dwarf and box B with that of neutron star , which box would weigh more on the earth ? Why ?