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What is the main evidence for the Big Bang theory?

The main evidence that we currently have to support the Big Bang Theory is the cosmic background radiation. This is electromagnetic radiation that appears to be evenly spread throughout the universe. It is m...
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Answered by Sam E. • Physics tutor
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Is a photon a wave or a particle??

This question was answered most famously by Young's double slit experiment. The double slit experiment shows that photons (as well as all light and matter) can be thought of as both a wave AND a particle. As...
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Answered by Jono G. • Physics tutor
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Why do all objects fall at the same rate in a vacuum, independent of mass?

This is only the case in a vacuum because there are no air particles, so there is no air resistance; gravity is the only force acting. You can see it for yourselves with this easy experiment: Take one piece ...
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Answered by Luke T. • Physics tutor
89101 Views

How do you calculate the Earth's escape velocity?

The escape velocity is the speed that an object must have in order to have enough energy to escape the Earth's gravitational field. To calculate the escape velocity, we can apply the principle of Conservatio...
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Answered by Aldwyn E. • Physics tutor
26922 Views

Why can't you hear any noise in space?

To understand this, we must first know how sound energy gets from one place to another. This is done via waves, of which there are two different types: longitudinal and transverse. Light is a transverse wave...
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Answered by James T. • Physics tutor
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