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Yogita Ingle 6 years, 3 months ago
Absolute Threshold:
An example that illustrates an absolute threshold is when a person goes has a hearing test done. An individual has to listen for the tones which are of different intensities. This threshold is likely to change as a person becomes older since there is likely to be age-related hearing loss. This is true for most of our senses which means that the actual value of the absolute threshold for each sense can change and is not the same for every person. Absolute intensity can also be used when assessing the fitness of individuals and for comparing the fitness of different groups of people.
Difference Threshold: An example of a difference threshold is having the ability to discriminate between two auditory tones that are being heard.
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Yogita Ingle 6 years, 3 months ago
- Escape velocity is the minimum velocity that a body must attain to escape the gravitational field of the earth.
- Suppose if we throw a ball,it will fall back. This is happening due to the force of gravitation exerted on the ball by the surface of the earth due to which the ball is attracted towards the surface of the earth.
- If we increase the velocity to such an extent that the object which is thrown up will never fall back.This velocity is known as escape velocity.
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Yogita Ingle 6 years, 3 months ago
- Ketones and aldehydes are functional isomers
- Ketones have functional group C=O while aldehydes have functional group CHO.
- The first member of ketone series is Propanone while that of aldehyde is Methanal.
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Yogita Ingle 6 years, 3 months ago
Octet rule Atoms can combine either by transfer of valence electrons from one atom to another (gaining or losing) or by sharing of valence electrons in order to have an octet in their valence shell.
Significance of octet rule It help to explain why different atom combine with each other to form ionic or covalent compounds.
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Yogita Ingle 6 years, 3 months ago
Since solvation energy of Lithium chloride is higher than that of Cesium chloride ,thus Lithium chloride is soluble in solvents such as Pyridine .
Solvation energy is the amount of energy released when one mole of substance combine with the solvent or gets solvated in the solvent.Thus instead of high lattice energy in case of Lithium chloride it gets Soluble in pyridine.
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When the rate of evaporation is low, at night or in the early morning, excess water gets collected in the form of droplets at the special openings of veins of leaves of many herbaceous plants. Such water loss in its liquid phase is called guttation.
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Sanjeev Mehra 6 years, 3 months ago
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