# Chapter 10

Quiz by Ryan Tram, updated more than 1 year ago
 Created by Ryan Tram over 3 years ago
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4

Astronomy

## Resource summary

### Question 1

Question
A Black Hole has mass MBH = 15 MSolar. What is its Schwarzschild radius?
• 50.5 km
• 44.24 km
• 76 km
• 100 km

### Question 2

Question
A Black Hole has mass MBH = 1800MSolar. What is its Schwarzschild radius?
• 150.5 km
• 444.24 km
• 5309.32 km
• 8769.60 km

### Question 3

Question
If the Schwarzschild radius of a Black Hole is 10 km, what is its mass?
• 15 Msolar
• 6.8 Msolar
• 35 Msolar
• 48 Msolar

### Question 4

Question
Why black holes are black?
• Because they do not have any energy
• Because nothing escapes
• Because radiation does not escape
• Because light does not escape

### Question 5

Question
What is at the center of a black hole?
• Another black hole
• A little galaxy
• The singularity point
• An X-ray source

### Question 6

Question
What is a supermassive black hole?
• Black hole with mass similar to the sun
• Black hole with mass similar to Jupiter
• Black hole with mass similar to 3Msolar
• Black hole with mass (thousand - billion) Msolar

### Question 7

Question
How did the Black Holes were predicted?
• By observation
• With optical telescopes
• Mathematically using Einstein’s general relativity theory

### Question 8

Question
• Electromagnetic effects
• Quantum effects
• Gravity effects
• Mechanical effects

### Question 9

Question
Where is the Hawking radiation emitted?
• Near the singularity
• Near the horizon
• From particles orbiting the black hole

### Question 10

Question
Two Black Holes have the following masses M1 = 100 Msolar and M2 = 40 Msolar . Show that Schwarzschild radius of the first black hole satisfies one of the relations given below. (Do not panic this is a really easy question!!. Hint: All you need is the relation that gives the Schwarzschild radius of a black hole. Look at the lecture slides.)

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