Please keep making these videos! They are helping many students around the world:)

Katarina, keep up the great work! These videos are a valuable resource for teachers like me ; ) and I know how time-consuming they are to make.

You can also measure the speed of light using a resonant cavity and electromagnetic waves of a known frequency. The relationship between wavelength and frequency directly gives you the speed of light. The electromagnetic waves can be obtained at home with a microwave oven, and the cavity is the inside of the oven. How do you measure the wavelength? Simple: waves bouncing between the walls create standing waves with evenly spaced nodes where the amplitude is zero. Those result in cold spots. If you spread marshmallows or thermal printer paper at the bottom of the microwave oven, you can visualize the cold and hot spots. This is also why microwave ovens have a turntable: it moves the food through the hot and cold spots so that on average, your burrito is evenly heated.

More videos please!

Beautiful.

I love this video. it not only informs but also gives me the opportunity to actively participate in the experiments.

Thank you!

An easy to remember which constant is which is by looking at the Greek letters used. Epsilon is E so that is the constant for the Electric field called the permittivity. Mu is the Greek letter M so that is the constant for the magnetic field, called the permeability. Even if you don't remember the names of the Greek letters or the names of the constants you can look at the letters and it becomes obvious. Epsilon looks like an E. Mu looks like a lower-case M as written in some foreign countries, like Spain.

Respected mam, I have some questions, it would be very helpful if you could answer for me,.... 1)Is it possible to produce em waves by oscillating the magnet to certain frequency?....if possible please explain how it's created sir 2)Can we produce em waves by oscillating the vandegraff generator?what's the difference between em wave produced from magnet, vandegraff,and AC current? 3)where does the energy of em wave come from?where the energy of em wave taken away from?? 4) how can an object obsorb the em wave...what does black body do when em wave falls on it,does it produce out of phase light wave which destructively interfere on incident wave...how can a em wave be destroyed? 5)can linearly accelerating, circulating, spinning charge produce light? How will that light look like? 6) does all AC circuits produce em waves, will AC circuit glow visibly when its frequency is frequency of visible light....why DC current does not produce em waves.... even though electrons collide with nucleus of the conductor and losses energy and ACCELERATES? 7)Why cannot neutral objects (Eventhough having positive and negative charge) does not produce em waves ...is it possible to produce em waves by shaking or vibrating the neutral object to certain high frequencies....how black bodies produce em waves?? Thank you mam

Where are the results

I love you

All electric and magnetic laws are based on SI International Measurement System with uses metric units (kilograms, meters). Volt is at the end (kg*m^2)/(A*s^3), ohm is at the end (kg*m^2)/(s^3*A^2). It would be much more consistent if you would use metric units as well in your experiments. Let's say at 7:55, why use inches? You even have a ruler with centimetres. In experiments with water/air pressure you talk about Blaise Pascal but never said that there is a metric unit Pa which is Newton over 1 square meter. Only PSI was shown. Let's encourage young people to use metric. World is metric and only Americans are behind. You will never switch if you will never try start from yourself. BTW - great videos :) UPDATE: After a day I need to really add few more words to my comment as it was to hard and somebody may think that I don't like the video. It's really pure gold in terms of how it was presented. All the knowledge should be presented in school like that. Presenter has very good talent, graphic is awesome, everything is awesome :) I wish you all best with next videos!

And you omitted the results because?

Please keep making these videos! They are helping many students around the world:)