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Test question 16.1

Test question 16.1. Mass of the Sun is measured with xA very large weight scale vApply Newton’s law to planets’ period and semi major axis xIts luminosity observed from the Earth xThe color of its surface radiation. Test question 16.2.

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Test question 16.1

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  1. Test question 16.1 • Mass of the Sun is measured with • xAvery large weight scale • vApplyNewton’s law to planets’ period and semi major axis • xItsluminosity observed from the Earth • xThecolor of its surface radiation.

  2. Test question 16.2 • A recently discovered planet has a semi major axis of 1 AU and a period of 182.5 days (1/2 of a year). The mass of its host star is • vFourtimes that of the Sun • xTwicethat of the Sun • xSameas the Sun • xHalfthat of the Sun

  3. Test question 16.3 • Sunspots appear dark because: • xNoradiation emits from them • xAllthe radiation emitted there has been absorbed • vGasis cooler in these regions • xVolcaniceruptions are taking place

  4. Test question 16.4 • The main energy source which powers the Sun is • vNuclearfusion at its core • xNuclearfission in its envelope • xGravitationalcontraction • xGasand coal

  5. Test question 16.5 Sun’s internal structure is mostly determined by • vHydrostaticequilibrium and radiation transfer • xAmountof radioactive isotope • xHowfar away it is from the Galactic center • xHowmany planets orbit around it.

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