LCD, LED and Plasma TV – What’s the Difference?

As the technology is advancing too rapidly, the extent of opting to choose between LCD, LED and Plasma TVs is too overwhelming.

As you walk into an electronics store searching for a perfect flat screen TV, you are sure to discover a dozen models that all look alike. Even if all the 3 types look similar outwardly, there are several internal differences that make them stand apart.

Why does a ship made of iron float while a piece of iron of same mass sink in water?

It’s because an iron ship is not completely solid. It has full of air filled in it. So the average density of the ship as a whole is less than the density of water. Therefore immersed portion of the ship displaces water equal to its weight. So the ship floats whereas a sheet of iron is compact and there are no air spaces inside it. Iron is denser than that of water. The weight of the sheet is greater than the weight of the water displaced by the sheet. So it sinks.

Why is the Ocean Salty?

All water, even rain water, contains dissolved chemicals which scientists call "salts." But not all water tastes salty. Salt doesn't evaporate when water evaporates. The rain flows back down to the sea, adding a little bit of salt to it constantly. Over millions of years, this makes the sea salty.

Fire Water Balloon - Cool Science Experiment

Why Is the Sky Blue?

Why Is the Sky Blue?

 The sun emits light that travels through space toward Earth because space is a vacuum. The light remains largely undisturbed until it nears the Earth, whose atmosphere is made up of a mixture of gas molecules (mainly oxygen and nitrogen) and other materials. The closer you get to the Earth, the thicker the atmosphere. Light from the sun appears white but is in fact a combination of colors, and the range of these colors that are visible to the human eye from red to violet, by way of orange, yellow, green, blue and indigo is shown when light is passed through a prism These different colors have different wavelengths and energies, with violet having the shortest wavelength and highest energy and red having the longest wavelength and lowest energy.

What is spectrum?

The electromagnetic spectrum is a vast band of energy frequencies extending from radio waves to gamma waves. When you listen to the radio, watch TV, or cook dinner in a microwave oven, you are using electromagnetic waves. It is represented by frequency (in Hertz) or Wave length (in meter). 

How compact fluorescent lamps (CFL) Works?

When an atom absorbs energy from any external source, it goes to excited state. When it come back to ground state it emits that energy in Ultra violet, Infrared or visible region. Normally tungsten filament emits light in uv region when it jumps from excited state to ground state. These photons hit the phosphor coating the inside of the fluorescent tube, and this phosphor creates visible light.

How do scientists measure the strength of an earthquake?

A few different scales measure how strong an earthquake is. The best known is the Richter scale, created in 1935, which uses an instrument called a seismograph to measure the size of the ground waves created by an earthquake.An earthquake’s size, or magnitude, generally ranges from 1 to 8 on the Richter scale (though the waves of some giant quakes have registered well beyond the top of the scale). The shock waves of an earthquake that registers a magnitude of 1 can only be detected with special instruments, while those with a magnitude of 8 cause massive damage.

Why do we see light followed by sound in thunder storm?

When thunder and lightning occur in a thunderstorm, we first see the light followed by the sound. Normally sound travels in waves and we can hear the sound when these waves hit our ears. Similarly light also travels as waves.

How can a microwave oven cook food so fast?

Unlike other ovens, which cook food with heat waves made from burning gas or electric currents, microwave ovens use special bands of electromagnetic energy called microwaves (similar to light waves) to cook food.

Acceptable Noise

In common use, the word noise means any unwanted sound. The amplitude level of the undesired background noise is measured in terms of decibel.

How does a vacuum cleaner pick up dirt?

James Spangler, a janitor at an Ohio department store who suffered from asthma, invented his “electric suction-sweeper,” in 1907 as way of picking up the dust and debris that triggered his health condition.

Why isn’t Pluto a planet anymore?

Pluto was once included in the list of planets, but is now considered a dwarf planet. Dwarf planet is an object in orbit around the Sun that is massive enough to have its own gravity to pull itself into a round (or nearly round) shape.

How did the universe begin?

Humankind has always puzzled over the origins of the universe. Scientists believe that the universe began with the Big Bang, a cosmic explosion that occurred between 10 and 20 billion years ago and threw matter in all directions.