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Ask QuestionPosted by Rakhi Agarwal 4 years, 7 months ago
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Posted by Chandru M.Chandru 4 years, 7 months ago
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Chandru M.Chandru 4 years, 7 months ago
Posted by Gaurav Kumar 4 years, 7 months ago
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Sneha Kumari 4 years, 7 months ago
Dharmender Balhara 4 years, 7 months ago
Yogita Ingle 4 years, 7 months ago
Sometimes we see water droplets on the outer surface of the glass containing ice-cold water this is because the water vapour presents in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.
Posted by Sujan Shrestha 4 years, 7 months ago
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Chandru M.Chandru 4 years, 7 months ago
Chandru M.Chandru 4 years, 7 months ago
Hariom Dalal 4 years, 7 months ago
Posted by Subhasini Nayak 4 years, 7 months ago
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Meghna Thapar 4 years, 3 months ago
- General ways of preventing infection are:
Public hygiene is one basic key to the prevention of infectious disease. In the method of prevention of diseases, following practices are adopted:
- To avoid exposure to air-borne microbes, adopt living conditions that are not overcrowded.
- To prevent exposure to water-borne microbes, safe drinking water should be provided.
- To avoid vector-borne infections, we can provide clean environment as it would not allow mosquito breeding.
- Specific way of preventing infections:
The specific ways relate to a peculiar property of the immune system that usually fights off microbial infections. During smallpox epidemics, it was noted that people who survived after suffering from smallpox, did not get infected with it again. Such observations led to the birth of immunization, which is a specific method of preventing infectious diseases.
When the immune system first sees an infectious microbe, it responds against it and then remembers it specifically. So the next time that particular microbe, or its close relatives enter the body, the immune system responds with even greater vigour. This eliminates the infection even more quickly than the first time around. This is the basis of the principle of immunization.
Vaccines work on the principle of immunization. Vaccines help a body's immune system prepare in advance to fight infectious illnesses and potentially deadly diseases caused by infectious agents or their by-products. Vaccines ‘fool’ the immune system into developing a memory for a particular infection by putting something that mimics the microbe we want to vaccinate against, into the body. Many such vaccines are now available for preventing a number of infectious diseases, and provide a disease-specific means of prevention like tetanus, diphtheria, whooping cough, measles and polio.
Posted by Dj Ranjan Bro Baripada 4 years, 7 months ago
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Loveena Singing & Mbbs Lover 4 years, 7 months ago
Yogita Ingle 4 years, 7 months ago
Amplitude: It is a measure of the loudness or softness of the sound. The magnitude of the maximum disturbance in the medium on either side of the mean value is called Amplitude of the wave, represented by the letter A.
Posted by Omhari Shukla 4 years, 7 months ago
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Gaurav Seth 4 years, 7 months ago
difference between colloidal solution, solution and suspension.
| Appearance | Clear Transparent Homogeneous |
Cloudy Heterogeneous |
Cloudy but Uniform & Heterogeneous |
| Particle Size | Molecule in size | Larger than 10,000Ao | 10−1000Ao |
| Tyndall effect | None | Variable | Light is dispersed |
December 20, 2019<a href="https://www.toppr.com/">
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Posted by Mohit Lathi 4 years, 7 months ago
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The Uchiha 4 years, 7 months ago
Posted by Nanda Pavan 4 years, 7 months ago
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Yogita Ingle 4 years, 7 months ago
Let us consider a binary mixture of A and B. let the number of moles of A and B bee nA and nB respectively, then
xA = nA/(nA+nB)
xB = nB/(nA+nB)
Here, xA+xB = nA/(nA+nB) + nB/(nA+nB)
xA+xB = 1.
The sum of the mole fractions of all the components in binary solution system must be equal to unity.
Posted by Archana Gupta 4 years, 7 months ago
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Akarsh Raj 4 years, 7 months ago
Bodasingi Sai Vaishnavi 4 years, 7 months ago
Yogita Ingle 4 years, 7 months ago
Yes , smell is not a matter , and the smell of perfume is also not a matter but the particles in air of the perfume is matter . When a particle of perfume is inhaled by our nose is causes a pleasant sensation in our nose thus causing smell, buy that sensation is not a matter, the matter is that particle floating in air
Posted by Rishabh Pradhan Ji 4 years, 7 months ago
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Posted by Jo Tesh 4 years, 7 months ago
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Ak Kumar 4 years, 7 months ago
Yogita Ingle 4 years, 7 months ago
Although the Rutherford atomic model was based on experimental observations it failed to explain certain things.
- Rutherford proposed that the electrons revolve around the nucleus in fixed paths called orbits. According to Maxwell, accelerated charged particles emit electromagnetic radiations and hence an electron revolving around the nucleus should emit electromagnetic radiation. This radiation would carry energy from the motion of the electron which would come at the cost of shrinking of orbits. Ultimately the electrons would collapse in the nucleus. Calculations have shown that as per Rutherford model an electron would collapse in the nucleus in less than 10-8 seconds. So Rutherford model was not in accordance with Maxwell’s theory and could not explain the stability of an atom.
- One of the drawbacks of the Rutherford model was also that he did not say anything about the arrangement of electrons in an atom which made his theory incomplete.
- Although the early atomic models were inaccurate and failed to explain certain experimental results, they were the base for future developments in the world of quantum mechanics.
Posted by Anshika Sharma 4 years, 7 months ago
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Yogita Ingle 4 years, 7 months ago
Many people would not know but liquids, including the humble water actually boils not due to the fact that we heat it but actually because when you heat water or any other liquid, it's pressure vis-a-vis atmospheric pressure changes.
In order to raise the boiling point of a liquid without adding anything in it, we can increase the pressure around the liquid, this can delay the boiling of the liquid and elevate the boiling point.
This is why in hill stations, it takes longer to cook or boil water, because the atmospheric pressure there is higher
Posted by Kavyashree Gnanamurugasen 4 years, 7 months ago
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Posted by Navjot Kaur 4 years, 7 months ago
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Akarsh Raj 4 years, 7 months ago
Yogita Ingle 4 years, 7 months ago
Rutherford used gold for his scattering experiment because gold is the most malleable metal and he wanted the thinnest layer as possible.
The gold sheet used was around 1000 atoms thick.
Therefore, Rutherford selected a Gold foil in his alpha scatttering experiment.
Posted by Navjot Kaur 4 years, 7 months ago
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Yogita Ingle 4 years, 7 months ago
Consider a body of mass m initially at rest. If on application of force F, it travels a distance s, then
Work done, W = F x s
By Newton's second law, F = ma
W = ma x s
where, a = acceleration
Using equation of motion v2 - u2 =2as, we get
(v2-u2)/2 = as
W = m x (v2 - u2)/2
As intial velocity is zero, W = ½mv2
This work done is stored as kinetic energy of the object.
So, KE = ½ mv2
Posted by Navjot Kaur 4 years, 7 months ago
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Sahil Dhanda 4 years, 7 months ago
Posted by Navjot Kaur 4 years, 7 months ago
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Yogita Ingle 4 years, 7 months ago
The places on a sound scientific footing by the duo scientists write were like the phenomenon of motion places.
This was mainly being developed by Galileo Galilei and Sir Isaac Newton.
These are some of the best experiments that are now being done in the history of science and further followed by these experiments.
Posted by Navjot Kaur 4 years, 7 months ago
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Posted by Navjot Kaur 4 years, 7 months ago
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Yogita Ingle 4 years, 7 months ago
A group of atoms carrying a charge is known as polyatomic ion, example of polyatomic cation: NH4+ and polyatomic anion: NO3-.
Posted by Navjot Kaur 4 years, 7 months ago
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Yogita Ingle 4 years, 7 months ago
Velocity = frequency x wavelength
Given data:
Frequency = 1000 Hz
Wavelength = 34 cm 34/100 = 0.34 m
Velocity = 1000 Hz x 0.34 m
Velocity = 340 ms-1
Distance = 1000 m
Formula of velocity
Velocity = distance / time
Time = distance / velocity
Time, t = 1000 m / 340 ms-1
t = 2.94 seconds
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