Question 1 If a main-sequence star were gaining mass by being in an interacting

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Question 1 If a main-sequence star were gaining mass by being in an interacting binary system, what would happen to that star's luminosity and why? a The Iniosity would decrease because the star would quickly turn into a white dwarf O b. The luminosity would increase because the star would become a nova O C The luminosity would decrease because the outgoing energy has to pass through more layers in the star O d. The luminosity would increase because the star's central pressure would rise and the rate of nuclear reactions would increase O e The luminosity would decrease because high-mass stars are fainter Question 2 Stars with masses similar to the Sun will lose approximately 30 percent of their mass before they become white dwarfs O True O False Question 3 The main difference between Cepheid stars and RR Lyrae stars is O a their masses b that Cepheids obey a period uminosity relation, but RR Lyrae, do not d that Cepheids form at much greater distances from Earth that RR Lyrae were dicovered much earlier than Cepheids Question 4 A person would feel as he approached the event horlz on of a black hole a intense heating b nothing c extremely strong tidal forces d strong infrared radiation e strong Hawking radiation

Explanation / Answer

1. The luminosity will increase because according to the mass luminosity relation whenever the mass is increased the luminosity also increases to 11.3 times. This is because the central pressure of the star will increase

2.true. white dwarf is the next stage of the life cycle of the sun. There is an excessive loss of the mass as the helium hydrogen ratio changes because hydrogen is consumed off and is now changing the star to white dwarf stage. It can also be more than 30 percent

3. RR lyrase have very short pulsation period ,approximately of a day or two, where as the other one can have pulsation period upto 6months

4.nothing, becausr it is the place of no return. The radiation from inside the black hole never reaches the outside and so the object will feel nothing and will paas the region

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