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  • It's AumSum Time

  • Hi guys.

  • Can you guess the title of my next video?

  • Shush.

  • Somebody's talking.

  • It's the trees.

  • Hurry up.

  • Write your guess in the comments section below.

  • Oh no.

  • I'm gonna die.

  • Just kidding.

  • Bananas contain a radioactive isotope of potassium called K-40.

  • But it doesn't lead to radiation poisoning.

  • How do I know?

  • Unit to measure radiation exposure is sievert.

  • According to research, radiation exposure should not exceed 50,000 millisieverts annually.

  • Eating a banana exposes us to only 0.1 microsieverts.

  • So, bananas won't cause radiation poisoning unless you eat millions of them at the same time.

  • Why do snakes have forked tongue?

  • Just for fashion.

  • Nope.

  • Even though snakes have noses, they smell odors of their prey.

  • Mate or surroundings with the help of their tongue and vomeronasal organ.

  • Each time a snake flicks its tongue in air, it collects odor particles.

  • Then when the tongue is brought back, the particles are transferred to the vomeronasal organ.

  • This organ detects the odors and sends signals to the brain, helping the snake smell.

  • That's interesting.

  • Now, we know that when we see with our two separate eyes.

  • Our brain combines the two different perspectives.

  • And makes a detailed image of our surrounding.

  • Similarly, because the tongue of a snake is forked.

  • It collects odor particles from two different locations.

  • Helping the snake understand in which direction the odor is coming from.

  • And thus, making it easier to locate the prey.

  • Topic: Archimedes' principle.

  • Why do ships float?

  • Good question.

  • Give me minimum five years to unravel its mystery.

  • Alright.

  • Don't bother.

  • To answer this question, we need to understand Archimedes' principle.

  • Archimedes' principle states that,

  • An object partly or fully immersed in a liquid experiences an upward force called buoyant force.

  • Which is equal to the weight of the liquid displaced by it.

  • Oh man.

  • It is too complicated.

  • Okay.

  • Wait, I'll explain.

  • A ship has a long and wide base due to which the amount.

  • And the weight of water displaced by it increases.

  • Now according to Archimedes' principle, the buoyant force is equal to the weight of displaced liquid.

  • Hence, as the weight of displaced water increases.

  • The buoyant force that is the upward force exerted by the water increases, making the ship float.

  • Topic: Forced vibrations.

  • Why does a guitar have a hollow box?

  • To keep clothes while traveling.

  • Not at all.

  • Wait, I'll explain.

  • Whenever we strike an object, it vibrates.

  • Sometimes, these vibrations influence other objects to vibrate.

  • The vibrations which take place under the influence of an external periodic force are called forced vibrations.

  • So, whenever I see delicious food, my stomach starts to vibrate.

  • Is this a type of forced vibration?

  • Please concentrate.

  • A guitar has a hollow box which holds quite a huge volume of air.

  • Now, when we strike its string, it starts to vibrate.

  • These vibrations influence the air in the hollow box, producing forced vibrations in them.

  • Now we know that vibrations in air produce sound.

  • Hence, as a huge volume of air is vibrating, the sound produced is louder.

  • Are Einstein's gravitational waves real?

  • No.

  • They are waves created by Titanic.

  • As always, you are wrong.

  • Gravity is the attractive force with which two objects pull each other.

  • However, Albert Einstein imagined gravity as well as space and time a little differently.

  • His theory of general relativity unified two separate entities space.

  • And time into a single entity called spacetime.

  • Spacetime can be considered as the fabric of universe.

  • Now, just like a heavy ball creates a curve or distorts the trampoline.

  • Mass of an object creates a curve in spacetime.

  • According to Einstein, this curve is gravity.

  • This trampoline is amazing.

  • First listen.

  • Just like our hands create ripples in water, moving objects create ripples in spacetime.

  • These ripples are termed as gravitational waves.

  • Gravitational waves were directly observed for the first time on September 14, 2015.

  • By Laser Interferometer Gravitational Observatory in the US.

It's AumSum Time

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香蕉會導致輻射中毒嗎?| 香蕉會引起輻射中毒嗎? (Can Bananas cause Radiation Poisoning? | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日
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