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Meghna Thapar 5 years, 7 months ago
A sound wave is described by the following characteristics:
i. Frequency: The number of complete oscillations per second is called the frequency (ν) of the sound wave. The unit of frequency is hertz (Hz).
ii. Amplitude: The magnitude of maximum disturbance in the medium on either side of the mean position is called the amplitude (A). The amplitude of a wave is the same as the amplitude of the vibrating body producing the wave.
iii. Speed: The distance travelled by a wave in one second is called the velocity or speed of the wave.
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The atomicity of ammonia is NH3.Ammonia is a compound of nitrogen and hydrogen with the formula NH3. It is a colourless gas with a characteristic pungent odour. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers.
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Animalia has been classified into 10 different subphyla based on their body design or differentiation.
The different subphylum of the animal kingdom are as follows:
- Porifera
- Coelenterata (Cnidaria)
- Platyhelminthes
- Nematoda
- Annelida
- Arthropoda
- Mollusca
- Echinodermata
- Protochordata
- Vertebrata
Posted by Shruti Harit 5 years, 8 months ago
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Meghna Thapar 5 years, 7 months ago
When we heat an egg, the proteins gain energy and shake apart the bonds between the parts of the amino-acid strings, causing the proteins to unfold. As the temperature increases, the proteins gain enough energy to form new, stronger bonds (covalent) with other protein molecules. When we boil an egg, the heat first breaks (unfolds) the proteins, and then allows the proteins to link to other proteins. As the proteins form these new, strong bonds, the water that surrounded each protein molecule when the egg was liquid is forced out. That's why the egg turns hard.
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Animals in colder regions have thick layers of fat, because fat acts as an insulator and doesn't let their body heat escape, which helps them survive in such extreme temperatures. Also, as not much vegetation is available in colder regions, the layers store nutrients that help the animal when needed.
Posted by Muskan Soni 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The mass of one atom of an element A = 2.65X10-23 g
We know the 1 mole of an atom = 6.023 x 1023 atoms
1 mole of an atom = its atomic mass
Mass of one atom of an element A = 2.65X10-23 g
Mass of 6.023 x 1023 atoms of an element A = 2.65X10-23 X6.023 x 1023
= 15.69 g
The element is oxygen
Posted by Muskan Soni 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
1 mole of oxygen molecules = 32 g of oxygen = {tex}6.022 X {10}^{23}{/tex} molecules
{tex}6.022 X {10}^{23}{/tex} molecules of {tex}{{O}{2}}{/tex} weigh 32 g.
1 molecule of ${{O}{2}}$ weigh = 32 / 6.022 {tex}X {10}^{23}{/tex}
= 5.313 {tex}x {10}^{-23}{/tex}g
Posted by Aafreen Warsi 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Steam is water heated to the point that it turns into gas. Water vapor is tiny water droplets that exist in the air.
Steam appears white or translucent whereas water vapor can appear transparent or translucent.
Steam is water vapour at a higher temperature. In steam, water is completely converted into a gas. In water vapor, there is still water droplets that are present, which can be further cooled down to turn back into water.
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Bats, have special types of wings. When they fly they produce ultrasonic waves. These waves are received by the ears of bat after they have been reflected by the object. The ears of the bat are so sensitive and trained that they not only get information of distance of the obstacle but also that of the nature of the reflecting surface.
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Yogita Ingle 5 years, 8 months ago
Nitrogen and Oxygen are the two major gases that are present in atmosphere. Carbon dioxide, argon, helium, hydrogen and ozone are present in atmosphere in small quantities.
Nitrogen makes up 78% of the total volume of the atmosphere.
Oxygen is the second most available gas in the air. It makes up 21% of the atmosphere. It is also known as the life giving gas as it is inhaled by human beings and animals.
Gases like argon, carbon dioxide, and water vapour constitute remaining one percent of the volume of atmosphere.
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