Astronomy

Star 'A' has twice the radius of star 'B'. The ratio of the surface area of star 'A' to the surface area of star 'B' is equal to

8
4pi
2
1/8
4

  1. 👍 0
  2. 👎 0
  3. 👁 141

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the

  2. SCIENCE HELP PLEEASE

    Given the following images, choose the one that most likely represents an O-class star. Star A is a yellow star. Star B is a blue star. Star C is a red star. Star D is a green star. A B C D is it b

  3. Physics

    Black Holes are suspected when a visible star is being noticeably pulled by an invisible partner that is more than 3 times as massive as the Sun. A red giant star is accelerated in a linear direction by gravity at 0.075 m/s2

  4. science

    Labels for Illustration of the Life Cycle of an Average Star You are making an illustration of the life cycle of an average star and the life cycle of a massive star as part of a computer animation. Drag each item to indicate

  1. Science

    which of the following can help astronomers detect if a star is part of a binary star system A. the star varies temperatures near the binary star B. the star wobbles near the binary star C. the star has very strong gravity D. the

  2. physics

    A star with an initial radius of 1.0 x 10^8 m and period of 30.0 days collapses suddenly to a radius of 1.0 x 10^4 m. (a) Find the period of rotation after collapse. (b) Find the work done by gravity during the collapse if the

  3. science help PLS

    An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving

  4. solid mensuration

    in a circle with diameter of 12 inches, a regular five-pointed star is inscribed. what is the area of that part not covered by the star?

  1. Physics

    Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system. This visible star has orbital speed v = 270 km/s, orbital period T = 1.6 days, and approximate mass m1 =

  2. Physics

    The mass of a certain neutron star is 5 × 10^30kg (2.5 solar masses) and its radius is 2000 m. What is the acceleration of gravity at the surface of this condensed, burned-out star? The value of the universal gravitational

  3. Physics

    A blue supergiant star has a radius of 7.4 × 10^10 m. The spherical surface behaves as a blackbody radiator. If the surface temperature is 2.4 × 10^4 K, what is the rate at which energy is radiated from the star? 2 × 10^3 J/s 4

  4. science help

    When nuclear fusion begins, what can be said about the internal processes within that star? Atoms in the star begin to split. Atoms in the star begin to combine. The star is turned into a nebula. The star is turned into a blue

You can view more similar questions or ask a new question.