Tnpsc and Upsc Notes Pdf
Pravin Babu R 
The ear is a sensitive organ used to hear. It converts the pressure variations in the air with audible frequencies into electric signals sent through the auditory nerve to the brain. The outer ear is known as Pinna. Pinna collects the sound. Then it travels via the auditory canal. At the auditory canal end, there … Read more
Christian Doppler (1803-1853), observed that the sound received by a listener is different from the original frequency produced when there is relative motion between the source and the receiver. What is the doppler effect? That is whenever the listener or source moves the frequency is changed from the original. This is called the Doppler effect. … Read more
Soft Sounds The sound is of a low volume and has a uniform wave pattern that gives a soothing effect. Examples Music such as Piano, Guitar, flute etc. Sounds of birds Hissing of snakes Loudness The sound which is of high volume, that causes irritation and pain to the ears is called Loud Sounds. The … Read more
Reflection of Sound Waves Sound is reflected or bounced back like a ball when it hit any object. Laws of reflection of sound The angle of incidence is equal to the angle reflected for a sound. The direction of the incident sound, direction of reflected sound, and the normal all lie in the same plane. … Read more
Speed It is the distance traveled by sound waves per unit time through an elastic medium. Speed (v) = Distance/ Time If the distance traveled by one wave is taken together as one wavelength (λ), and therefore the time taken for this propagation is just one time period (T), Speed (v) = One Wavelength (λ) … Read more
Loudness Pitch Timbre Loudness and Intensity Loudness is a measure of which a sound can be differentiated from another one, that has the same frequency. Loudness or softness depends on the amplitude. Loud sound travels long-distance than as loudness or soundness is associate with higher energy. Sound decreases as we move away from the source … Read more
Difference between Niti aayog and the Planning commission Niti aayog Niti Aayog is the apex public policy think tank of the Government of India. Also, the nodal agency handles the task of accelerating economic development and fostering cooperative federalism. This development through fostering cooperative federalism is done with the involvement of the State governments of … Read more
Affirmative Action Affirmative action is a principle to promote societal equality through the preferential treatment of socially and economically disadvantaged people. Mostly, these people are disadvantaged for historical reasons, such as oppression or slavery. Support for affirmative action has sought to achieve a range of goals: For example, a 2017 study found that affirmative action … Read more
As socio–psychologists describe, Human beings identify themselves as part of their group. They felt prestigious and energetic only when they are recognized as a part of their own group. What discrimination means is that out-grouping their own members from the membership of their group or banning their members from accessing natural resources. Indeed, wealth is … Read more
Economic equality can be identified by an individual’s income and the value of the property, he possesses in society. Otherwise, the gap between rich people community and poor may indicate the status of economic equality. Further, by calculating the number of people under the poverty line, we may draw strong inferences and resolutions. This kind … Read more