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What color is the atom?
All things around us have some colour or they are for instance, transparent. But what colour are the atoms from which it is all made? First of all, we will distinguish what the possibilities are for a ...
The first possibility is that the thing (the Sun, a bulb, fire) emits light. In this case, the colour of light is determined by the material of the body and its temperature (so the Sun is yellow just because it consists of hydrogen and has a temperature of about 6,000 °C). Iron is orange during the casting just because it has a certain temperature and because it consists of iron ...
Is the electricity returning to the power plant?
If we build a simple electrical circuit, electric current flows from the battery into the bulb, turns it on, and then flows to the other pole of the battery ...
I will try to explain the question with an analogy of the postal services. We use electricity to fulfil its work and the post office to send packages. In the case of the electricity, charged particles (especially electrons, but also ions) do the work. At the post office, the postman does the work (in the case of Amazon, a drone is planned) ...
What would happen to a man inside a particle accelerator?
In the particle accelerator, particles collide at a speed close to the speed of light, creating a number of exotic particles ...
It could be expected that outside of sci-fi movies, we will not know how a human would end up if they were exposed to the current of really accelerated particles in the accelerator, but in the 1970s, something similar happened in Russia. Anatoly Bgorsky inserted his head into a proton accelerator because of a failure in the security device and beams of accelerated protons flew through his head ...
How wide is the rainbow?
In addition to visible light, there are other components in the electromagnetic spectrum — ultraviolet and infrared, radio and X-rays ...
Light colour is made by its frequency and as you write correctly, light is a type of electromagnetic wave and is specific “only” by that it is about the frequencies we see. The frequency of the electromagnetic waves can be arbitrary and so our perception is limited to a narrow part of the spectrum (in frequencies 1014 Hz) ...
Text in a car’s rearview mirror
Why is the ambulance sign on an ambulance reversed when looking in the mirror and it is clear that the sides of the displayed object do not change — what is to the right in front of the mirror i ...
A convex mirror is used in a car’s rearview mirror — this is the reason it always creates a reduced and inverted image. But the image that is created is reversed. If you want to shake your right hand with your image in the mirror, you will see for yourself. From our point of view, the hand is on the right, but in reality one would shake your hand from the left ...
Hypothetical rescue in a falling elevator
Can I save myself in a falling elevator by jumping just before impact?
I hope that no one will have to experience this situation because it will not be possible to jump in a falling elevator — I will explain the situation where we do not take into account the air resistance. If an elevator falls, the elevator will move with the acceleration of gravity g (we won’t count air resistance) ...
Lift forces on an aerobatic aircraft
How is it possible for an airplane to fly horizontally during aerobatics, even when it is upside down? The lift on the wings should pull him down and not up…
It is true that the plane takes off due to the geometry of the wings. The upper part is more bulging than the lower part and therefore the air flows at a higher speed around the upper part of the wing than the lower part. And it follows from Bernoulli’s equation that the higher the velocity of the fluid, the lower the pressure at a given location ...
Creation of vacuum by explosion
An explosion (e.g. a nuclear bomb) creates a pressure wave, i.e. air spreads outwards from the epicenter. Does this mean that a vacuum is created at the site after the explosion?
Yes, that’s right. A pressure wave is typically created by an explosion (it doesn’t matter what the source is) compressing the surrounding air. Because air is a flexible environment, this compression will spread further. You can try something similar yourself — just push water in a pool (or in a bath or pond) with your palm ...
