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The best explanation is given by this man.Finally I understood the definition of a second .

Nice explanation by Pat Gill, I thought the pacing was good. For those of you complaining about the pacing, this is Open University content for those studying for degrees - those of us fortunate enough to have attended a bricks and mortar college recall lecturers pacing delivery too quickly to be able to make notes and comprehend the lecture.

So if there are 9,172,632,770 periods, how fast is that electron moving?

@EastBurningRed

2 жыл бұрын

According to wikipedia, the radius of a cesium atom is 265 pm. The circumference is therefore 1.66nm. Multiplying by 9,192,631,770 rotations per second we get 15.3 m/s or 55 km/h or 34 miles per hour. Fast but not highway fast.

@lunam7249

Жыл бұрын

c/ alpha constant, c x (1/137) = 3E8 /137 = 2.189781 E6 meters per second...really really fast

@lunam7249

Жыл бұрын

@@EastBurningRed although the electron is orbiting the nucleus, we are not mesuring this....we measure its jumping up 1 shell level then dropping back down to the start level, this jumping is happenning 9 billion times per second.... the orbit speed = (light speed c / 137), is so fast it makes quantum cloud😮🎉🎉❤

Why exactly that weird number of oscillations?

Thank you sir this was very informative and I finally understood this concept! :)

why cesium?

Seems they have a really hard time to explain what they want call a second

@BeelySalasBlair-uy5wn

3 ай бұрын

So much involved, no? lol

very educative. thank you. . regards,

thank you sir

This video desperately needs volume boosting and equalling between scenes. I can't watch it because some parts are too quiet to hear, even at max volume.

good sir

Just used 549 seconds to understand one second

why is he talking so slow?

@KD-sn6pg

7 жыл бұрын

His second is slower.

@pepper669

6 жыл бұрын

His talking is very precise and that takes time.

inter -esting... video.

Poor presenter...