The primary reason that NPN transistors are used more often than PNP transistors is that they usually operate faster (at higher frequencies) because the mobility of the current carriers in NPN transistors (electrons) is much higher than that of the current carriers in PNP transistors (holes).

the particle arrangements of a liquid is that the particles and atoms are a bit separated from each other. In a solid, they are closely packed together. In a gas they have no particular particle arrangement and are very far apart.

wheat. The process is known as willowing and separates the wheat from the chaff.

Gold. The process is known as panning and separates the gold from silt.

uranium. The process is known as enriching and separates the docile U238 from the nasty U235

W on the periodic table. the element with the highest melting/boiling point is tungsten.

To travel at the speed of light you would have to BE light so i guess you would became an even brighter light

The switch to turn on the lights will work but no light will come on as you are already at that speed

Roof tiles follow a corrugated design to keep water from pooling under the tiles. If water gets under the tiles, it could damage the roof, the interior of the house and possible the entire structure.

ause the boigraphical heat which is being given off which can not escape from the jar because they are designed to be sealed as tight as the owner wants them to be!

Connect p-n junction in reverse bias applying 5 Volt DC.

Keep it in controlled heating device

If diode is made up of Ge increase temp upto 50 C

For Silicon temp. should be raised to 125 C

For Ge heat up to 50 C and switch off heating.

record current in ammeter (micro Amps) with each 5 C decrease in temp.

Plot graph of 1000/Temp. on X-Axis Vs. Log of Saturation current Is.

Calculate Slope of straight line obtained

Band gap(eV) = slope/5.036

You will have to look it up in a databook to be certain.

4200 J per Kg per Kelvin

Physical properties can be tested without changing the substance a new substance. Color, density, volume and melting and/or boiling point are examples of physical properties that can be observed and/or tested.

As far as we understand physics today, we won't ever be able to get to the speed of light. The faster you go, the harder it gets to go any faster. So that last little fraction will "always" remain impossible - or at least until someone invents a whole new branch of physics.

Density is the mass (weight) of a standard volume. So if you had one litre of air and one litre of lead the lead would have the higher density

Physicists do help people, even if it's not direct, e.g. without Physicists, there wouldn't be coloured TV, but even though Physicists didn't make the coloured TV, they're research on the three colours red green and blue was essential.

Flow rate is volume of liqid flowing per unit time, velocity is displacement per unit time. For a constant cross-section area, the flow rate would increase with velocity and vice versa. This is because the volume flowing per unit time obviously increases if distance covered by the fluid increases.

Picture a fluid flowing through a cylindrical pipe.

Liquid is more dense than air. This causes it to support more weight and require less effort to lift.

Volume restricted only by the size of the container.

Molecular Solid

It is a matter of timing. The correct answer is most likely yes. At some scale all objects would expand before exploding. If you were to watch a bomb go off on a video and watched on a film that captued 20 frames a second you would not see it expand. If it captured 500 frames per second, again you may not see it. At 10,000 frames per second (not possable that I am aware of) you would watch the bomb expand prior to the skin of it rupturing. If a bomb exploded but did not have enough explosives in it, it would most certainly just expand and not rupture (explode)

Heat con conduction is efficient metals

No, freezing changes a liquid to a solid.

To change a solid to a liquid you need to apply heat. The change begins when the solid reaches its melting point.

Such a strip is made from two metals with different expansion coefficients. When temperature changes it bends because of the different expansion of the two sides