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Yogita Ingle 5 years, 11 months ago
- A rainbow is an arch of seven colours and is produced by the dispersion of the Sun’s light by tiny raindrops present in the atmosphere.
- The observer receives only one colour from the raindrop at a time.
- The red rays from the drops make a certain angle with the eye line joining the Sun and the observer.
- So, all water drops which appear red will make the same angle with the line of vision.
- Hence, they will appear in the form of an arc of a circle with its centre on the eye line.
- The other colours also appear in a similar manner.
- Red rays make an angle of 42.8° with the line of vision and is seen on the outer edge of the rainbow.
- Violet rays make an angle of 40.8° with the line of vision and is seen on the inner edge of the rainbow.
- Thus, the rainbow appears in the form of a bow or a semi circle
Posted by Aaditya Singh 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The part of the eye appears to be colored is called Iris .IRIS is the part of the eye that regulates the amount of light that penetrates the eye,which in combination of amount and type of PIGMENT present in the eye determine the color of the eye . Stroma ,in front of the eye and Epithelium in the back of iris also play a part in giving the color to the eye.
Posted by Diksha? 5 years, 11 months ago
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Posted by Sunny Gupta 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
There should be an equitable distribution of natural resources among people so that every individual be it poor or rich gets an equal amount of resources to use.
Powerful and rich people grab a major part of resources by using money and power. Human greed, corruption are also some of the forces that are preventing an equitable distribution of resources.
Posted by Faisal Khan 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Mendeleev’s periodic law states that "the physical and chemical properties of all elements are the periodic function of their atomic masses".
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Yogita Ingle 5 years, 11 months ago
- Carbon is not good at fully giving up or taking away electrons from a nucleus.
- Its electronegativity is around in the middle in the periodic table.
- It is more energetically favorable to share the electrons between the atoms and to donate and accept electrons.
- Carbon has 4 electrons in its outermost shell (and because each covalent bond requires a donation of 1 electron, per atom, to the bond) carbon has exactly four bonds to make, and is only stable if all 4 of these bonds are used.
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Posted by Technical Sohaik 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Muscle cramp is an involuntary sudden contraction of muscle. Muscle cramps are caused due to over usage of muscle i.e. long run, rapid exercise etc. Cramps are also caused due to dehydration, muscle strain, holding in position for a long time.
After a strenuous exercise muscles experience lack of oxygen. In the absence or insufficiency of oxygen, they respire anaerobically thereby producing lactic acid. The accumulation of lactic acid causes cramps in muscles.
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By ohm law, I = V/R
9/13.4 = 0.67 A
All the resistance are connected in series. Hence, the current across 12 ohm resistance is 0.67A .
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Sun is at the farthest distance during sunset and sunrise.the white light from the sun gets scattered as it travels towrds the earth. The blue colour gets scattered the most, the lightreaching teh eye has white light minus blue light scattered away. red light which is relativley less scattered reaches us the max. hence the sun appears red.
Posted by Dinesh Kumar 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Atomic Number
- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
- It is represented with the letter ‘Z.’
- All the atoms of a particular element have the same number of protons, and hence the same atomic number.
- Atoms of different elements have different atomic numbers.
- For example, all carbon atoms have the atomic number of 6, whereas all atoms of Oxygen have 8 protons in their nucleus.
Mass Number
- The number of protons and neutrons combined to give us the mass number of an atom.
- It is represented using the letter ‘A.’
- As both protons and neutrons are present in the nucleus of an atom, they are together called nucleons.
- For example, an atom of carbon has 6 protons and 6 neutrons. Thus, its mass number is 12.
- While the number of protons remains the same in all atoms of an element, the number of neutrons can vary. Thus, atoms of the same element can have different mass numbers, and these are called isotopes.
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Yogita Ingle 5 years, 11 months ago
Dicot seed: The seed having two cotyledons is called dicot seed. For e.g., gram and bean seed.
On the basis of the presence or absence of endosperm, both in dicot and monocot seed, they are classified as endospermic or non-endospermic seeds.
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Yogita Ingle 5 years, 11 months ago
There are mainly five types of organic reactions:
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