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Gaurav Seth 7 years, 3 months ago
Drawbacks of the Rutherford atomic model-
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The model is applicable for one electron system.
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According to Rutherford as the electron revolves around the nucleus it liberate energy regularly so when the electron loses all its energy it should fall in the nucleus which was impossible.
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The model does not give the objection raised by Clerk Maxwell related to continuous emission of energy by electron.
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The Rutherford’s model of atom does not say anything about the arrangement of electrons in an atom.
Posted by Muskan Sultana 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Inter-cropping and crop rotation are used to obtain maximum benefit. Inter-cropping helps in preventing pests and diseases to spread throughout the field. It also increases soil fertility, whereas crop rotation prevents soil depletion, increases soil fertility, and reduces soil erosion. Both these methods reduce the need for fertilizers. It also helps in controlling weeds and controls the growth of pathogens and pests in crops.
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Yogita Ingle 7 years, 3 months ago
- The physical quantities for which both magnitude and direction are defined distinctly are known as vector quantities.
- Force and displacement are vector quantities because of they have both magnitude and direction.
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Yogita Ingle 7 years, 3 months ago
- Xylem is a vascular and mechanical tissue.
- Xylem is composed of cells of four different types:
- 1. Tracheids 2. Vessels or tracheae 3. Xylem parenchyma 4. Xylem sclerenchyma (or fibers).
- Except xylem parenchyma, all other elements are dead and bounded by thick lignified wall.
- Tracheids and vessels are tubular structures.
- The main function of xylem is to carry water and mineral salts upward from the root to different parts of shoots, hence also called water conducting tissue.
Posted by Lalmohan Baitha 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
When an object vibrates, the particles in the surrounding medium vibrate. These particles send the vibrations to adjacent particles and energy continues to transmit until it reaches our ears.
A wave is a disturbance moving through a medium when the particles of a medium set the adjacent particles into vibration.
The particles do not move forward, but the disturbance does.When these vibrations reaches our ears, the ears allow us to convert pressure variations in the air with audible frequencies into electric signals that travel through the brain via the auditory nerves.
Posted by Gaurav Kumar 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
The number of atoms present in a single molecule is termed as its atomicity.
Atomicity of an element is a measure of the total number of atoms present in a molecule. For example, an oxygen molecule (written as O2) consists of 2 atoms of oxygen (O) and hence an atomicity of 2. Similarly, an ozone molecule (O3) consists of 3 atoms of oxygen and has an atomicity of 3.
Posted by Aryan Vats 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Newton's universal law of gravitation explains the attractive force between any two objects which have mass. It explains how we are able to stand on earth, why a body thrown up falls to the ground, why planets revolve around the sun and why the moon revolves around the earth, and so on. This law says that as the distance between two objects increases their force of attraction decreases. This explains why we are not pulled towards a distant star even though it is more massive than the Earth.
This law leads to the derivation of an expresion for the acceleration due to gravity. Think about it - you may get more points.
Posted by Karan Rajiv 7 years, 3 months ago
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Vedant Pillai 7 years, 3 months ago
Yogita Ingle 7 years, 3 months ago
Working of Human Ear
- Sound waves are collected by the pinna and then are directed through ear canal sound waves on striking the eardrum make it vibrate exactly the same way as the given sound emitting object.
- The bones in thge middle ear start vibrating when eardrum vibrates. It helps in magnifying the vibrations. When the magnified vibrations reach the cochlea in the inner ear, the fluid in it starts vibrating.
- These vibrationsare picked up by sensory receptors and are converted into electrical signals.
- These electrical signals then travel to the brain which interprets sound.
Posted by Ankit Kumar Tiwary 7 years, 3 months ago
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- Newton's First Law of Motion: Any object remains in the state of rest or in uniform motion along a straight line, until it is compelled to change the state by applying external force.
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Gaurav Seth 7 years, 3 months ago
Transverse Waves
Waves in which the medium moves at right angles to the direction of the wave.
Examples of transverse waves:
- Water waves (ripples of gravity waves, not sound through water)
- Light waves
- S-wave earthquake waves
- Stringed instruments
- Torsion wave
The high point of a transverse wave is a crest. The low part is a trough.
Longitudinal Wave:
A longitudinal wave has the movement of the particles in the medium in the same dimension as the direction of movement of the wave.
Examples of longitudinal waves:
- Sound waves
- P-type earthquake waves
- Compression wave
Parts of longitudinal waves:
Compression: where the particles are close together.
Rarefaction: where the particles are spread apart.
Posted by Shreya Dwivedi 7 years, 3 months ago
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Shreeya Gupta 7 years, 3 months ago
1Thank You