30 Questions
What is the name given to a star with a radius of about 10 km?
Neutron Star
Which of the following statements is true about a star's magnitude?
A star with a negative magnitude is brighter than a star with a zero magnitude.
What is the maximum mass of a star that can become a white dwarf?
2 M
What is the term for the total energy radiated into space per second from the surface of a star?
Absolute luminosity
What is the average distance from the Earth to the Sun?
1.49 × 10^8 km
What is the condition for the formation of a black hole?
If the star's mass is greater than 5M.
What happens to the photons emitted by a black hole?
They cannot escape from its surface due to strong gravitational pull.
What is the result of the combination of electrons and protons in a neutron star?
The formation of neutrons.
What is the relation between the brightness of a star and its magnitude?
The brightness of a star is inversely proportional to its magnitude.
What is the magnitude of a star with a brightness of l?
0
What is the surface temperature of a star classified as 'F' type according to its spectral type?
7.5 10^3 K
What is the relationship between the colour of a star and its temperature, as expressed by Wien's displacement law?
λm ∝ 1/T
What can be used to find the masses of two stars in a binary system?
Equation (iii)
What is the spectral type of our sun?
G
What is the total energy radiated by a star per second, given by?
E = σT^4 × 4πR^2
What is the primary factor that determines the spectral type of a star?
Surface temperature
Which of the following statements is true about the energy radiated by a star?
It is directly proportional to its surface temperature
What is the colour of a star with a surface temperature of approximately 1.5 × 10⁴ K?
Blue
What is the significance of the parameter σ in the equation for the energy radiated by a star?
It is the Stefan-Boltzmann constant
What is the relationship between the spectral type of a star and its colour?
The surface temperature determines both the spectral type and the colour
What is the estimated number of pulsars in the universe?
100
What is the minimum wavelength of light associated with the hottest stars in the galaxy?
Blue
What is the approximate mass of the Milky Way galaxy?
150 solar masses
What is the characteristic of the electromagnetic waves emitted by a pulsar?
Pulsating
What is the term for a group of stars that are gravitationally bound together?
Star Cluster
What is the primary reason for the formation of a comet's tail?
Heat from the Sun's radiation
What is the name of the method used to measure the distance of nearby stars?
Parallax method
What is a characteristic feature of stars?
They are countless in number
What is the reason for the twinkling of stars at night?
Atmospheric refraction
What is a characteristic of a star's motion?
It appears to move from west to east
Learn about the different types of stars, their properties, and the constellations near the celestial poles. Understand the concepts of neutron stars, white dwarfs, and more.
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