Astrophysics Introduction Quiz

What is the primary focus of the first lesson in astrophysics?

• The scale of the universe

• The chemical composition of stars

• The history of physics

• The laws of motion

Which equation is used to calculate the power of an emitting blackbody?

• E=mc^2

• The equation for gravitational force

• F=ma

• The equation for blackbody radiation

Why is Pluto no longer considered a planet?

• It is too small

• It does not orbit the Sun

• It is not spherical

• It has not cleared its orbital neighborhood

What is an astronomical unit (AU)?

• The distance from the Earth to the Moon

• The distance from the Sun to Pluto

• The distance light travels in one year

• The average distance between the Earth and the Sun

How many light-years is a parsec approximately equivalent to?

• 1.5 light-years

• 2.5 light-years

• 4.5 light-years

• 3.26 light-years

What does the term 'arcsecond' refer to in astronomical measurements?

• A unit of angular measurement

• A unit of time

• A unit of distance

• A unit of mass

What was significant about the first image of a black hole?

• It disproved the existence of black holes

• It showed a black hole in our solar system

• It was the first time a black hole was theorized

• It was the first direct image of a black hole

How was the first image of a black hole captured?

• Through a space probe sent to the black hole

• With a satellite orbiting the black hole

• Using a single large telescope

• By combining data from multiple telescopes around the Earth

What is the approximate mass of the black hole in the first image compared to our Sun?

• 10 billion times the mass of the Sun

• 3 billion times the mass of the Sun

• 6.5 billion times the mass of the Sun

• 1.5 million times the mass of the Sun

What is the significance of micro arc seconds in the context of the black hole image?

• They measure the brightness of the black hole

• They indicate the size of the black hole

• They represent the angular size of the black hole in the sky

• They are used to calculate the distance to the black hole