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Since there is no air in space, many people ask whether it is possible to shoot in space. The answer is impossible. The functions of the modern guns we see are similar to those of rockets. Firing a gun means we make an explosion between the bullets. The bullet contains the required amount of fuel. As a result of the explosion in it, the smoke began to rise rapidly from it. As a result, the bullet moves forward according to Newton’s third law of reaction. Just like a rocket. As a result, even if there is no air, the rocket does not have any difficulty moving in space. Similarly, there will be no difficulty in the shooting.

But now the question is, shot after shot and what will happen to you? If the temperature in space is more than 100 degrees Celsius, the bullet will explode by itself. And if the temperature is below -173 degrees centigrade, the metal structure of the gun will wobble. As soon as you shoot, your bullet will shatter into pieces. Yet if the temperature is favorable and you shoot, it can be, like embracing your death a bit.

Since there is no air in space, according to Newton’s first law, your bullet can continue in space unhindered. And if it goes like this, the bullet from the back will make a full circle like a satellite and it will blow your head. Not only that. We know that when a gun is fired, the gun will also push you back according to Newton’s law of reaction. Since there is no air, there is no one to stop you. As a result, you will be knocked out at a much higher speed. If it is towards Earth, the value of velocity will be much higher. And if you run at this speed, the friction of your body with the air can raise your body and the surrounding air to thousands of degrees Celsius. So that it is impossible to find the ashes of your body. But if luck is too good you can expect to survive with the help of your slingshot. In that case, the International Space Station can help you a bit.

Sometimes a special compound is added separately to some parts of the body. It is possible to get important information about the organ by looking at the amount of that compound. To understand the amount of the compound, one of the atoms of the compound is replaced with a radioactive isotope, and the amount of the compound in a certain organ can be understood from the radiation of that radioactive isotope. Usually, the isotope emits gamma rays and these gamma rays can be detected externally.

A striking example of the use of radioactive isotopes is Positron Emission Tomography (PET). Whereas the radioactive isotope emits a positron. It combines with electrons and converts them into energy. These two energies are emitted in opposite directions as gamma rays. Therefore, by detecting two gamma rays of specific energy in opposite directions, the source of the positron can be deduced. From that information, we can not only know the existence of positron production but also tell exactly where and how much there is. By adding such an isotope to glucose by emitting positrons, we can use PET to find out how much glucose is stored in the brain. From this information, it is possible to extract the information on which part of the brain is more active and used more glucose. PET technology has played a revolutionary role in revealing the workings of the human brain.

Radioactive isotopes are used not only to diagnose diseases or determine the functioning of organs. Diseases are also cured with it. Cobalt-60 is a gamma ray emitting isotope, using this isotope to destroy cancer cells with gamma rays. Iodine-131 is used in the treatment of the thyroid gland. It is so effective in thyroid treatment that thyroid surgery is not required these days. Besides, phosphate-containing radioactive isotope phosphorus-32 is used in the treatment of blood cancer called leukemia.

Although there are many scales of light rays, we hear UV rays most often because of their many uses. Notable among them are-
350-370 nanometers: Used to attract flies or insects.
300-320 nanometers: Used in light therapy.
300-365 nanometers: Used in printing ink or polymer versions.
250-300 nanometers: Used in forensic analysis or drug detection.
270-300 nanometers: Used in protein analysis, DNA synthesis, or drug preparation.
230-365 nanometers: Used for identification of national identity cards, barcodes, or labels.
230-400 nanometers: Used to make light sensors in electronics.
Although it has many beneficial uses, it is also directly harmful to us. When ultraviolet rays fall on the skin, some of the cells inside our skin are broken or destroyed. As a result, the tension of the skin is gradually lost. That’s why those who work more in the sunlight, their skin shrinks quickly, wrinkles fall, and the skin shows signs of aging quickly. Loss of skin moisture, dullness, dark spots, etc. can be caused by the effect of ultraviolet rays.

However, several layers of the atmosphere are protected from the ultraviolet rays of our sun.

Blowing up a balloon and putting a piece of scotch tape on it and piercing the balloon with a pin over the scotch tape will show that all the air inside the balloon has been forced out through the hole and the balloon has become silent. The air pressure inside the balloon was higher and the air pressure outside the balloon was lower. So as the high pressure gets a hole, the air in the balloon rushes towards the low-pressure area. It is essentially secretion. If you try to blow the balloon without putting scotch tape here, it will burst loudly.

Again, a bicycle or truck tire leaks and the gas in the tire escapes with noise at a fast speed, which is an example of a leak. Applying heat increases the rate of both diffusion and emission. So if the truck had a flat tire while it was moving, the noise would be louder. Because in that case the temperature of the gas would be higher and the gas would go out faster. And if there was a leak in the steady state, the noise would be less because in that case, the gas would escape at a lower speed due to the lower temperature of the gas.