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Questions and Answers

What is the name given to a star with a radius of about 10 km?

  • Black Hole
  • Neutron Star (correct)
  • Supernova
  • White Dwarf

    • 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. (correct)
  • A star's magnitude is a measure of its distance from Earth.
  • A star with a magnitude of zero is the brightest star in the sky.
  • A star with a negative magnitude is less bright than a star with a zero magnitude.

    • What is the maximum mass of a star that can become a white dwarf?

  • 2 M (correct)
  • 1 M
  • 10 M
  • 5 M

    • What is the term for the total energy radiated into space per second from the surface of a star?

    <p>Absolute luminosity</p> Signup and view all the answers

    What is the average distance from the Earth to the Sun?

    <p>1.49 × 10^8 km</p> Signup and view all the answers

    What is the condition for the formation of a black hole?

    <p>If the star's mass is greater than 5M.</p> Signup and view all the answers

    What happens to the photons emitted by a black hole?

    <p>They cannot escape from its surface due to strong gravitational pull.</p> Signup and view all the answers

    What is the result of the combination of electrons and protons in a neutron star?

    <p>The formation of neutrons.</p> Signup and view all the answers

    What is the relation between the brightness of a star and its magnitude?

    <p>The brightness of a star is inversely proportional to its magnitude.</p> Signup and view all the answers

    What is the magnitude of a star with a brightness of l?

    <p>0</p> Signup and view all the answers

    What is the surface temperature of a star classified as 'F' type according to its spectral type?

    <p>7.5  10^3 K</p> Signup and view all the answers

    What is the relationship between the colour of a star and its temperature, as expressed by Wien's displacement law?

    <p>λm ∝ 1/T</p> Signup and view all the answers

    What can be used to find the masses of two stars in a binary system?

    <p>Equation (iii)</p> Signup and view all the answers

    What is the spectral type of our sun?

    <p>G</p> Signup and view all the answers

    What is the total energy radiated by a star per second, given by?

    <p>E = σT^4 × 4πR^2</p> Signup and view all the answers

    What is the primary factor that determines the spectral type of a star?

    <p>Surface temperature</p> Signup and view all the answers

    Which of the following statements is true about the energy radiated by a star?

    <p>It is directly proportional to its surface temperature</p> Signup and view all the answers

    What is the colour of a star with a surface temperature of approximately 1.5 × 10⁴ K?

    <p>Blue</p> Signup and view all the answers

    What is the significance of the parameter σ in the equation for the energy radiated by a star?

    <p>It is the Stefan-Boltzmann constant</p> Signup and view all the answers

    What is the relationship between the spectral type of a star and its colour?

    <p>The surface temperature determines both the spectral type and the colour</p> Signup and view all the answers

    What is the estimated number of pulsars in the universe?

    <p>100</p> Signup and view all the answers

    What is the minimum wavelength of light associated with the hottest stars in the galaxy?

    <p>Blue</p> Signup and view all the answers

    What is the approximate mass of the Milky Way galaxy?

    <p>150 solar masses</p> Signup and view all the answers

    What is the characteristic of the electromagnetic waves emitted by a pulsar?

    <p>Pulsating</p> Signup and view all the answers

    What is the term for a group of stars that are gravitationally bound together?

    <p>Star Cluster</p> Signup and view all the answers

    What is the primary reason for the formation of a comet's tail?

    <p>Heat from the Sun's radiation</p> Signup and view all the answers

    What is the name of the method used to measure the distance of nearby stars?

    <p>Parallax method</p> Signup and view all the answers

    What is a characteristic feature of stars?

    <p>They are countless in number</p> Signup and view all the answers

    What is the reason for the twinkling of stars at night?

    <p>Atmospheric refraction</p> Signup and view all the answers

    What is a characteristic of a star's motion?

    <p>It appears to move from west to east</p> Signup and view all the answers

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