Understanding Hubble's Law and Red Shift

The video tutorial explains Hubble's Law and its role in demonstrating the universe's expansion. It covers Edwin Hubble's discovery of red shift in deep space objects, indicating they are moving away from Earth. The tutorial delves into the Doppler effect, illustrating how wave frequency changes with motion, and how this principle applies to light from stars. It explains how red shift helps determine the movement and speed of celestial objects, supporting the Big Bang Theory by suggesting the universe is expanding from a central point.

Who was Edwin Hubble, and what did he confirm in 1929?

• An astronomer who confirmed the universe is static.

• An astronomer who confirmed the universe is expanding.

• A physicist who discovered black holes.

• A scientist who invented the telescope.

What is the Doppler effect?

• A method to measure the temperature of stars.

• A process where sound waves are absorbed by materials.

• A phenomenon where light bends around objects.

• A change in wave frequency due to the motion between the observer and the source.

How does the Doppler effect manifest in sound waves?

• Sound waves change color.

• Sound waves become invisible.

• Sound waves change pitch as the source moves.

• Sound waves stop moving.

What happens to light waves from a star moving away from an observer?

• They stop emitting light.

• They shift to the red side of the spectrum.

• They become invisible.

• They shift to the blue side of the spectrum.

What do spectral lines tell astronomers about stars?

• The color of the star.

• The elements present in the star.

• The size of the star.

• The age of the star.

How can we determine the speed of an object moving away from Earth?

• By measuring its temperature.

• By observing the shift in its spectral lines.

• By calculating its distance from the sun.

• By analyzing its gravitational pull.

What did Hubble's observations about the universe's expansion support?

• The Big Bang Theory.

• The Theory of Relativity.

• The Steady State Theory.

• The Theory of Evolution.

What does the red shift of light from distant galaxies indicate?

• Galaxies are shrinking.

• Galaxies are moving towards us.

• Galaxies are stationary.

• Galaxies are moving away from us.

What conclusion can be drawn if the universe is expanding?

• The universe is becoming more chaotic.

• The universe originated from a single point.

• The universe is getting colder.

• The universe is getting smaller.

How does the concept of red shift support the Big Bang Theory?

• It proves that stars are becoming colder.

• It demonstrates that the universe is expanding from a central point.

• It indicates that the universe is contracting.

• It shows that galaxies are moving towards each other.