Calculate the time it would take for Sagittarius A* to completely evaporate.
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- A black hole can lose energy as radiation as per the quantum mechanical model. This happens through pair production. One of the particles created will escape before reaching the event horizon and will carry some of the black hole's energy. This is known as Hawking radiation.
- The time it would take for a black hole to completely evaporate is given by,
Here M0 is the mass of the blackhole and α is a constant with a value of 3.96 × 1015 kg3∙s-1.
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- Q3.2 The supergiant star has a surface temperature of about 2900 K and emits a power of approximately 4 x 1030 W. Assuming that is a perfect emitter and spherical, find its radius. (hint: Area of the sphere is A = 4πr²)Suppose there are three stars moving with the same total speed of 40 km/s but in three different directions:(A) moving away at an angle of 45 degrees from your line of sight, (B) moving directly away from you, (C) moving perpendicular to your line of sight. List the stars in order of increasing amount of shift you see in their spectral lines (the smallest shift first).Find the speed for a star in which this line appears at wavelength 120.5 nmnm. Express your answer to three significant figures and include the appropriate units.
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