10 Most Asked Physics Questions (with answers)

By Umang Rajpurohit

Hey, Everybody hope you all are doing great. This time we are up with most asked physics questions with their answers. Point to note all the answers in this article are answered by Michio Kaku(Professor of theoritical Physics at city college of New York ). Michio kaku have also written several books on physics and related topics.
 

1. We live in 4 dimensions and can see 3. But how many dimensions are there ?

Einstein said we live in a four dimensional world. We can go forward, backward, left, right, up, down. And the fourth dimension is time. But now, we're beyond Einstein and we have to go beyond four dimensions to perhaps, let's say 10, 11 dimensions. But where are these other dimensions ? We think they have curled up. They are so small that you cannot enter them. But perhaps, we can fee their effects. Then, where are the other dimnsions. It is off the plane of our universe. Perhaps a parallel universe hovering right about our universe in another dimension that we cannot see or touch, but perhaps there's a gateway connecting them. That gateway is a worm hole.

It was Einstein himself in 1935, who introduced the concept of a worm hole, a gateway between higher dimensional universe.

2. Why do atoms create bonds ?

Atoms want to bond together. That's why we have people DNA. Our universe is based on atoms which like bond with each other. The electron vibrates back and forth binding them together and that's why we have ourselves(our existence). We are a consequence of the fact that electrons are shared between different atoms, using the laws of the quantum theory.

3. How do black holes distort time ?

Time does not beat uniformly throughout the universe. Clocks on the moon beat a little bit faster than that of the clocks on the our planet. On jupiter, clocks beat slower than on our planet earth. The heavier the planet the slower time beats. 

This means that on a star like the sun, time beats even slower and the ultimate star, ofcourse is the black hole, the remnants of a dying star. We think  that at the very center of the black hole time stops.

4. What is the "String theory" ?

First of all, most textbooks say an electron is a dot. Particles that we see in our atoms measures as dots. But if we have a microscope we could see that, that dot is actually a rubber band. From a distance a rubber band looks like a dot. Close up, we see that it is a vibrating string. The rubber band can tremble in many different modes. Each mode can be called a particle. So, for example, that might be an electron. But if you twirl it in a different way, it becomes a quark. 

Now, How many ways can one string vibrate ? The answer is obvious an infinite number of vibrations on the same string and so, we think that all the sub atomic particles of the universe, the quarks, the neutrons, the mesons, the protons, the neutrons, there's a galaxy of these particles.

5. What is the "GOD Equation" ?

Well,  Einstein spent the last 30 years of his life chasing after the GOD equation, an equation perhaps not more than one inch long that would allow us to "read the mind of god" a theory would unite the two branches of physics.

On one hand, we have the theory of the big(immense), general relativity, black holes, big bangs and the theory of the small, quantum theory, atomic physics. How can you unite these two into one theory ? At the present time these two theories does not like each other. They are based on different mathematics, different principles, different concepts. And yet we believe in our hearts of hearts, there has to be master theory out there, the holy grail of physics. And we think is the GOD equation. 

The foremost and only candidate for that is string theory.

6. What is a "quark" ?

Scientists think that inside the proton there exists three quarks, subatomic particles that make up the protons and neutrons, which in turn make up our universe.

7. What does that mean if you were to fall into a black hole ?

From your point  of view, it would take perhaps a few minutes to fall through a black hole, depending upon where you started from your watch says that you went right through to the centre of the black hole. But from outward place, somebody using a telescope, looking at you from outer space, would see you frozen in time, slowly going into the black hole. Because time beats at a different rate from the outside of the black hole and inside the black hole.

8. Can light bend around corners ? 

Yes, light can bend around corners. That's why we have glass inside our glasses.When light touches and go through into glass, it slows down to some degree. Because it slows down, it deviates from a straight line. And that is the reason you have glasses, microscopes, telescopes, because glass bends light.  Also, As Einstein showed us, gravity can bend light. And we can actually see as it goes around a galaxy .

9. What is dark matter ? Can it be touched ? Is it dangerous ?

As you 90% of the universe is made out of dark matter. Dark matter surrounds the milky way galaxy.If there would be no dark matter, the milky way galaxy would have been spun out of control and the earth and other planets would be flunging into outer space. Can it be touched ? No, cause it would filter right through your fingertips, right through the atoms of your body. Is it dangerous ? No, because it doesn't interrelate with us. 

10. How are black holes and infinite density even possible ? How does something get so dense that collapses on itself ?

We know if we take a gigantic star or a galaxy and comprises it, it's gravity is so great that nothing known to science can escape the clutches of gravity. So. light itself is shut in by the black hole. And according to books, it collapses to apoint of infinite density. There is no such thing as infinite density. Infinite density is a shorthand of saying, "I  don't know". We really don't know what happens at the very centre of a black hole.

If we do the mathematics carefully you realize that the black hole is spinning and spinning stars collapse to a ring. They don't collapse to a ring. They don't collapse to a dot at all and if you fall through the ring, the mathematics says that you fall not just through the ring, but you fall to the other side to a parallel universe. 

That is on the other side of black hole, there is a white hole everything that falls in gets blown out the other end.

About Me

               Umang is a student of geography pursuing bachelor's in geography  who enjoys indulging his passion including reading geography  books and writing  geography articles. This blog is about 10 Popular National Parks and Wildlife Sanctuaries Everyone Should Visit . My goal is to make every post valuable and something I'd want to read. Its mostly a Educational blog, meant to inspire. You can find my videos on youtube  (there's a link in the upper right to jump to them) but posts are almost about geography .Other than writing blog on geography i also do illustration on Instagram. Enjoy Umang