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Naveen Sharma 8 years, 4 months ago
Plastic are strong, lightweight, electrical insulators and resistant to chemicals and they are generally cheaper than metal so these properties make them highly versatile materials for making numerous household and industrial goods. For e.g. Polythene, a thermoplastic is use widely as packaging material for liquid. Polystyrene is used for making electronic items.
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Amar Kumar 8 years, 4 months ago
The physicist Ernst Ruska and the electrical engineer Max Knoll constructed the prototype electron microscope in 1931, capable of four-hundred-power magnification; the apparatus was the first demonstration of the principles of electron microscopy.
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Amar Kumar 8 years, 4 months ago
A metal is a material that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.
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Payal Singh 8 years, 4 months ago
Protoplasm is colourless material comprising the living part of a cell, including the cytoplasm, nucleus, and other organelles.
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Amar Kumar 8 years, 4 months ago
Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively.
A vibrating object will produce sound waves in the air. For example, when the head of a drum is hit with a mallet, the drumhead vibrates and produces sound waves. ... The region of compression moves outward as the energy from the vibrating drumhead is transferred to groups of molecules farther and farther away.
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Amar Kumar 8 years, 4 months ago
“Pollution” is any degradation of a larger environment by substances introduced to it externally.
Explanation:
Air pollution is either by particulate matter or gaseous compounds.
Water pollution is usually by either solid or liquid compounds that are not a normal part of the water system, or at levels greatly exceeding the normal levels of those compounds in a water system.
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Amar Kumar 8 years, 4 months ago
Principal focus or focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection
Acentral point of attention or interest
Amar Kumar 8 years, 4 months ago
A point at which rays of light, heat, or other radiation meet after being refracted or reflected or appearing to meet.
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Amar Kumar 8 years, 4 months ago
Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second. The speed of sound is also affected by other factors such as humidity and air pressure.Heat is also a kind of kinetic energy like sound
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Amar Kumar 8 years, 4 months ago
LPG
It has more calorific value about 55000 kJ/kg
It does not cause any environmental problem.
It is smokeless fuel.
It is easy to store and can be easily transported in cylinders and pipelines.
Low Ignition temprature
Wood
It has less calorific value about 17000 to 22000 kJ/kg
On burning wood release unburnt carbon particles which cause diseases such as asthma
It gives out lot of smoke
It needs a lot of space to store also very difficult to transport.
High Ignition temprature
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