Tag Info

New answers tagged

1

If the source is far away, light acquires a certain degree of coherence. Have a look at the Van Cittert–Zernike theorem, also in wikipedia: "the wavefront from an incoherent source will appear mostly coherent at large distances". The resulting fringes are different for different colors, but any color has max for straightforward direction. So, you see the ...


0

I don't really see a difference between the microwave measurement and the definitions of the SI units. We have Unit of time: second: The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. Unit of length: meter: The ...


4

I'm not an engineer, but this is how id do it. According to your rules, we can use a computer, and Audacity. You get a pair of headphones. You plug the headphones into the microphone jack on your computer. You open Audacity. You get a very small magnet. You glue the very small magnet to one of the fan blades. You turn the fan on. You hold one of the ...


1

You might find the Faraday Effect easier. Since it was actually done by Faraday it is quite easy. You need a glass or plastic rod aligned with the magnetic field you want to measure, a monochromatic or coherent light source, a couple of polarizing filters and a photodiode. The magnetic field rotates the plane of polarization proportional to the field in the ...


0

we feel warm after the bath in the bathroom because as the temperature of the water is cool when compare to temperature of the body.So,that the body cools & the surrounding temperature become hot or warm(humidity).


3

If you get another chance to observe such a problem (where adjacent "identical" experiments give different but individually repeatable results), try changing one factor at a time. swap marbles (projectile/target) swap marbles with another experiment swap tracks swap location in the lab swap operators And look at all the data: is the distance flown by ...


1

Keep in mind that momentum is conserved. These results can indicate that the marble on the track had an initial y component of momentum, the stationary marble had an initial y component of momentum, or that more forces were acting on the marbles than you are aware of. Or something else went wrong, like the carbon paper was moved. I would guess that this ...


14

The wavelengths that stimulate vitamin D production are between 280nm and 320nm, which is called UVB. You would need to use a detector capable of measuring light in this wavelength. However there is no need, because normal windows are made from soda-lime glass and this transmits no wavelengths shorter than about 350nm. Some Googling will find you the ...


0

Note that this is not a nuclear reactor, but a Fusor. Fusors work by using a voltage drop to accelerate ions to high velocities and a few may fuse. Due to inefficiencies, they cannot be used for power generation. They are relatively simple to build (they are basically beefed-up plasma globes).


-2

Due to abrupt transference of heat energy from hot oil to cold water drop.


0

Particle accelerator that can fit on a tabletop opens new chapter for science research June 20, 2013 - sourced by University of Texas at Austin The laser plasma accelerator has accelerated about half a billion electrons to 2 gigaelectronvolts over a distance of about 1 inch. It's a downsizing of a factor of approximately 10,000, and marks a major ...


-2

With the movement of the spoon you give energy to the particles and molecules.In this way the molecules increase their kinetic energy and many of them escape from the cup of the tea.Therefore the use of a spoon for cooling a cup of tea is valid!


1

I was unable to see any Fraunhofer lines with the sun light, despite using a focusing lens. However, I tried examining the light of a fluorescent bulb instead. I didn't manage to project the image on a sheet of paper, but I was able to take a direct picture of the image in the prism. The result is a bit more satisfying: / Are these four lines a ...


0

Usually, the microwaves are too weak to heat anything to a plasma state. However, if you bypass the manufacturer’s instructions and turn on the microwave with nothing in it to absorb energy, the microwave energy density will be much higher than normal. Now, the reason you cut the grape in half is: "Now it turns out that grapes are just the right size to ...


14

The resolving power of a prism is given by the formula $$ \frac{\lambda}{\Delta \lambda} = b\ \frac{dn}{d\lambda},$$ where $b$ is the base length of the prism, $\lambda$ is the wavelength and $n(\lambda)$ is the refractive index. You don't say, but let's assume you are using a crown glass prism. According to this useful document, crown class has ...


2

Oil boils at a higher temperature than water which means that when water is poured into boiling oil it is heated to, and past, the boiling point very quickly. Oil is also less dense than water meaning that the water will sink to the bottom of the pot. Water at the bottom of the pot being heated very rapidly forms a gas at the bottom of the pot underneath ...



Top 50 recent answers are included