Radiation Pressure | Physics with Professor Matt Anderson | M25-17

Did you know that sunlight can push on you? Kind of crazy, right. Turns out, if you put a big mylar sheet in space, the sunlight will push on it and accelerate it to 100,000 mph in about a year. Whaaaat?
Physics with Professor Matt Anderson

[@roshnibatra9047]

Beautifully explained

[@fizixx]

Super! First time I heard about this kind of thing was about the time I started physics. Saw this in a book, but it was a flashlight that was turned on and the question was asking for the speed, or acceleration....I don't recall exactly, but I still have the book. I couldn't believe it, but here we are, at a time where we're sending things up into space to check this kind of effect. Very, very kewl 😎

[@yoprofmatt]

I agree. Wacky and fun. Cheers, Dr. A

[@ernstuzhansky]

Great explanation. Many thanks!

[@jamesjohn2537]

Thanks a lot i like your explanation and teachings, it's clear and precise for brain intakes... I wishes you teach me all of physics, I can understand every single bytes of problems encountered in it.

[@yoprofmatt]

Great to hear. Welcome aboard. Cheers, Dr. A

[@jamesjohn2537]

@@yoprofmatt thanks and cheers

[@zachh6868]

I like your teaching style. You make it interesting

[@nishantyadav659]

nice explanation

[@neeki10]

This was so clear explanation 🙌🙌

[@AR-fm9xt]

Do RF waves have similar momentum transfer action? For example, can they be used to move objects just as solar radiation in the UV/Vis/IR spectrum is used in spacecraft sails? I see no reference to the radiation frequency mentioned here so I'm assuming this is limited to optical frequencies (optical tweezing etc.).

[@virupannamedikinal]

Thank you so much

[@yoprofmatt]

You bet. Cheers, Dr. A

[@martinsoos]

When we use a solar cell to collect light, are we collecting the spin energy of a photon as well as the momentum to get more energy out of electricity than we would from just reflecting light? I can get a lot of force out of a small solar panel and a water pump, and I just don't see that much force from the push of light.

[@yoprofmatt]

Light has considerable energy, but not much momentum. We know this, because when you stand in the sunlight, you get warm, but you don't get knocked over. Cheers, Dr. A

[@martinsoos]

@@yoprofmatt But where is that energy?

[@martinsoos]

Or I should ask, how much energy is in momentum and how much energy is in other forms?

[@namename3130]

@@martinsoos momentum isnt a form of energy

[@namename3130]

@@martinsoos the only energy a photon has is of its own form and is given by e = hf

[@wolfdomination1905]

The fact he can easily write backwards alone impresses me.

[@greenpewdiepie4207]

He’s not. The picture is inverted about the vertical.

[@Al-cynic]

What is that 'slapinator 5000' in the background? more annoying than the MIFE in the lab I worked in.

[@ic.1101]

Let's talk about something else...

[@r.i.p.volodya]

Is he really writing everything backwards??

[@nightowlvisuals6272]

Are you in front of a classroom here?

[@yoprofmatt]

Yes. A small group in a studio. Cheers, Dr. A

[@GP-qb9hi]

How can light have momentum with no mass? In one sentence please.

[@wolfdomination1905]

The very nature of energy is to move things, mass is basically the byproduct of this force of energy pushing in all directions there for creating resistance while being stationary or moving instead of being required to travel at the speed of light to create resistance, ps: ask chat GPT.

[@GP-qb9hi]

@@wolfdomination1905 I did: " Light can have momentum despite having zero mass due to its wave-particle duality, where its momentum arises from its energy and wave properties."

[@DragonHeart5150]

In Outerspace, there is virtually no resistance, but there is a great deal of space junk and debris floating around that would shred the sails.. So, your question of why anyone would want to try this, stands. Humans are basically pigs. I thoroughly like your classes.

[@yoprofmatt]

Total pigs. You should have seen my room in college! Cheers, Dr. A