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Yogita Ingle 7 years, 6 months ago
Unwanted plants which grow in the field are called weeds, e.g. Xanthium (gokhroo), Parthenium (gajar ghas), Cyperinus rotundus (motha). Weeds hamper the growth of crops. Some weeds are poisonous and can harm cattle and humans. Hence, timely removal of weeds is necessary for better growth of crops.
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Yogita Ingle 7 years, 6 months ago
Neils Bohr, a Danish physicist, in 1913 proposed model of atom which rectified the problems left by Rutherford’s Model. He proposed that
- Electrons revolve round the nucleus in a fixed orbit.
- He called these orbits as ‘stationary orbit’.
- Each stationary orbit is associated with fixed amount of energy, thus electrons do not radiate energy as long as they keep on revolving around the nucleus in fixed orbit.
Posted by Neha Panwar 7 years, 6 months ago
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Yogita Ingle 7 years, 6 months ago
J. J. Thomson proposed the model of atom similar to a Christmas Pudding or similar to a water melon. His model of atom is generally called plum and pudding model of atom.
He proposed that electrons are embedded the way black seeds of water melon are embedded; in the sphere of positive charge. According to Thomson
(a) An atom consists of positively charged sphere in which electrons are embedded.
(b) The quanta of negative and positive charges are equal. The equal number of negative charge and positive charge makes an atom electrically neutral.
Posted by Neha Panwar 7 years, 6 months ago
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Yogita Ingle 7 years, 6 months ago
The Rutherford's Model of Atom is as follows:
- Most of the part in an atom is empty.
- There is a positively charged center in atom, which contains nearly the whole mass of atom. The centre is called nucleus.
- The size of nucleus is very small compared to an atom.
- Electrons revolve round the nucleus.
The Rutherford’s Experiment is also known as Geiger-Marsden Experiment.
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Yogita Ingle 7 years, 6 months ago
Ice in fact it is solid but it has cage like structure and hence its molecules have more empty space as compared to water so it has smaller density then water and hence floats on water.
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Yogita Ingle 7 years, 6 months ago
| Solid | Liquid | Gas |
| Solid refers to a form of matter which has structural rigidity and has a firm shape which cannot be changed easily. | Liquid is a substance, that flows freely, having a definite volume but no permanent shape. | Gas refers to a state of matter, do not have any shape but conform to the shape of the container, completely, in which it is put in. |
| Fixed shape and volume. | No fixed shape but has volume. | Neither definite shape nor volume. |
| Arrangement of molecules is regular and closely arranged. | Arrangement of molecules is random and little sparsely arranged. | Arrangement of molecules is random and more sparsely arranged. |
| Cannot flow | Flows from higher to lower level. | Flows in all directions. |
| Negligible molecular motion | Brownian molecular motion | Free, constant and random molecular motion. |
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