Тёмный

The second 

National Physical Laboratory
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The second is the SI base unit for time.
For more information: www.npl.co.uk/reference/measur...
Produced in association with the Open University.

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5 июл 2024

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Комментарии : 22   
@tijman1
@tijman1 7 лет назад
VIEW video at 1.25 speed
@051_cse_mathialagant8
@051_cse_mathialagant8 5 лет назад
The best explanation is given by this man.Finally I understood the definition of a second .
@indieshack4476
@indieshack4476 3 года назад
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.
@andrewbrennan8446
@andrewbrennan8446 4 года назад
So if there are 9,172,632,770 periods, how fast is that electron moving?
@EastBurningRed
@EastBurningRed 2 года назад
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
@lunam7249 Год назад
c/ alpha constant, c x (1/137) = 3E8 /137 = 2.189781 E6 meters per second...really really fast
@lunam7249
@lunam7249 Год назад
@@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😮🎉🎉❤
@henokbrehanu9426
@henokbrehanu9426 2 месяца назад
Why exactly that weird number of oscillations?
@gauriaggarwall4126
@gauriaggarwall4126 4 года назад
Thank you sir this was very informative and I finally understood this concept! :)
@seshachary5580
@seshachary5580 7 лет назад
very educative. thank you. . regards,
@alann2595
@alann2595 8 лет назад
Seems they have a really hard time to explain what they want call a second
@BeelySalasBlair-uy5wn
@BeelySalasBlair-uy5wn 5 месяцев назад
So much involved, no? lol
@GEAsolar
@GEAsolar 4 года назад
why cesium?
@balwinderkaursandhu9853
@balwinderkaursandhu9853 7 лет назад
thank you sir
@Axelios
@Axelios 7 лет назад
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.
@Kapil_vidayak_ji
@Kapil_vidayak_ji 6 лет назад
good sir
@anhilatorofignorance2584
@anhilatorofignorance2584 2 года назад
Just used 549 seconds to understand one second
@headshot308ps3
@headshot308ps3 10 лет назад
why is he talking so slow?
@KD-sn6pg
@KD-sn6pg 7 лет назад
His second is slower.
@pepper669
@pepper669 7 лет назад
His talking is very precise and that takes time.
@glennvang1302
@glennvang1302 7 лет назад
inter -esting... video.
@Penguin_of_Death
@Penguin_of_Death 11 лет назад
Poor presenter...
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