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Posted by Abhinav Anand 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Materials needed:tall glass jar,bell,candle
Method : take a glass jar. attach a small bell to the bottom of the cap of the jar. close the jar with the cap. shakethe bottle and note the sound made by bell. now open the jar,place lighted candle in it and close thr jar again. wait for the candle to be extinguished. shake the bottle again. the sound is not produced.
The oxygen is taken up by the candle.
So the bell does not produce any sound.
This proves that sound needs a medium to travel.
Posted by Mayank Jhariya 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Note: An impure sound produced by mixture of many frequencies is called a note. For example: A musical note has tones of various frequencies.
Posted by Naina Choudhary. 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Pitch is a characteristic of sound waves. It allows distinguishing between two sound waves travelling with same speed and arriving our ears at the same time.
It is the frequency of sound wave interpreted by our brain.
Posted by Anuj Mohod 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Sound is produced due to the vibration of objects. Vibration is the rapid to and fro motion of an object.
Vibrating objects are the source of all sounds Irregular, chaotic vibrations produce noise Regular, controlled vibration can produce music All sound is a combination of pure frequencies
A stretched rubber band when plucked vibrates and produces sound.
Posted by Pushti Bhardwaj 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
The postulates of this theory may be stated as follows:
- Matters are composed of very tiny particles called atoms.
- These particles are too small to see and cannot be created or destroyed in a chemical reaction.
- Atoms of a specified element are identical in mass and chemical properties.
- Atoms of different elements have different masses and chemical properties.
- Atoms combine in the ratio of small whole numbers to form compounds.
- The relative number and kinds of atoms are constant in a given compound.
Posted by Krishak Garcha 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
Crop production management refers to controlling the various aspects of crop production, to obtain the maximum and best yield. It has three components: nutrient management, irrigation and cropping pattern.
- Nutrient management:
Nutrient management means controlling the selection, timing and amount of nutrient supply to the crops. Like other living organisms, plants also require inorganic elements called nutrients. Nutrients are supplied to the plants by air, water and soil.
ii. Irrigation:
The process of supplying water to crop plants by means of canals, wells, reservoirs, tube-wells, etc. is known as irrigation. Most agriculture in India is rain-fed, that is, the success of crops in most areas is dependent on timely monsoons and sufficient rainfall spread through most of the growing season. Hence, poor monsoons cause crop failure.
iii. Cropping patterns:
These are models of raising crops which help in obtaining maximum benefit from the same piece of land, reduce risk of crop failure, disease and infestation.
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Meghna Thapar 5 years, 7 months ago
Pressure is the force acting on a unit area of the object. Thus,
Pressure= thrust/area
Substituting the SI unit of thrust and area we get the SI unit of pressure as N/m2 or N m–2. It is also called as Pascal.
The same force acting on a smaller area exerts a larger pressure, and a smaller pressure on a larger area.
Examples of some observations on the basis of pressure:
- A school bag has wide straps so that the weight of the books may spread over a large area of child’s shoulder producing less pressure.
- A knife cuts things better due to the thin edges of its blades, the force of hands falls on a very small area of object being cut, producing high pressure.
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Meghna Thapar 5 years, 7 months ago
Applications of ultrasound:
- Ultrasound is used in industry for detecting flaws in metal blocks without damaging them.
- Ultrasound is used in industry to clean ‘hard to reach’ parts of objects such as spiral tubes, odd-shaped machines and electronic components, etc.
- It is used to investigate the internal organs of the human body such as liver, gall bladder, pancreas, kidneys, etc.
- Ultrasound scans are used to monitor the development of foetus inside the mother’s uterus.
- It is used to break kidney stones into fine grains which then get flushed out with urine.
- It is used in ‘sonar’ apparatus to measure the depth of sea and to locate the under-sea objects like hidden ice bergs in the sea.
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Prashant Jinwal 5 years, 7 months ago
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