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Yogita Ingle 7 years ago
Physical properties of metal
- Metals are solid except mercury that is found in liquid state at room temperature.
- They are hard and tough except sodium and potassium that can be cut with a knife.
- They are lustrous i.e. they shine in light because metals possess free electrons that vibrates on getting in contact with light.
- They have high melting points except caesium and gallium have very low melting point.
- They are good conductors of heat and electricity. The best conductors of electricity are silver and copper whereas lead and mercury are comparatively poor conductors.
Physical properties of non-metals
- Non-metals may be either solids, liquids or gases.
- Solid non-metals are brittle and break down into powdery mass on striking with a hammer except diamond which is the hardest non-metal.
- They have a dull luster but iodine is lustorous.
- They have low melting points except diamond that has very high melting point.
- They are poor conductors of heat and electricity except graphite.
- They are not malleable.
- They are not ductile.
- They are not sonorous.
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Meghna Thapar 5 years, 9 months ago
The metal reeds which are connected to the frame of the harmonium are the vibrating parts of the harmonium. Harmonium is one of the most used musical instruments in the classical Indian music genre. In Manjira the whole body vibrates. In Ghatam vibrations are transferred through the saddle and bridge (the parts that connect the strings to the body) into the body wood which creates the acoustics and amplify the sound. Ektara is the strings which when set in motion produces sound. harmonium is the metal frames within that vibrate causing its sound.
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Yogita Ingle 7 years ago
The two and fro motion of an object about its mean position is called oscillation.
A motion that repeats itself over and over again about its mean position, such that it remains confined within two well defined extreme positions on either side of the mean positionis called oscillatory motion. All oscillatory motions are periodic but all periodic motions are not oscillatory.
Posted by Laxmi Prajapati 7 years ago
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Yogita Ingle 7 years ago
- Pitch is defined as the number of waves perceived by the observer (listener).
- Pitch depends on the frequency.
- Pitch may be different for the different listeners for same frequency.
Posted by Laxmi Prajapati 7 years ago
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Yogita Ingle 7 years ago
Wavelength – The distance between identical points in the adjacent cycles or crests of a wave is called wavelength. It is also measured in meters.
Wavelength = speed / frequency
Posted by Shubham Singh 7 years ago
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Yogita Ingle 7 years ago
Urbanization is a population shift from rural to urban areas, and the ways in which society adapts to the change. It predominantly results in the physical growth of urban areas, be it horizontal or vertical. The United Nations projected that half of the world's population would live in urban areas at the end of 2008.
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