Skip to main content

PHYSICS (SOUND)


Think like a proton and stay positive




Sound waves are mechanical longitudinal waves and require a medium for their propagation.







Sound cannot propagate through vacuum.
When it propagates, speed and wavelength changes but the frequency remain constant.
It is of three types
Infrasonic waves – (0 to 20 Hz)
Audible waves – (20 to 20,000 Hz)
Ultrasonic waves – (>20,000 Hz)



Properties of Sound Wave

Reflection

  • The bouncing back of sound when it strikes a hard surface, is called reflection of sound.
  • The laws of reflection of light are also obeyed during reflection of sound.
  • The working of megaphone, soundboards, and ear trumpets are based on the reflection of sound.
  • The repetition of sound due to reflection of sound waves, is called an echo.



  • The minimum distance from a sound-reflecting surface to hear an echo is nearly 17 m.

  • The persistence of hearing on the human ear is 1/10th of a second.


  • Soundproof rooms are made of two layers of walls having a vacuum between them. 

Reverberation

  • It arises due to multiple reflections of sound.
  • While designing an auditorium for speech or musical concerts, one has to take proper care for the absorption and reflection of sound.
  • Time taken by reverberant sound to decrease its intensity by a factor of 106 is called reverberation time.







REFRACTION

When a sound wave moves from one mechanical medium to another mechanical medium, it shows deviation from the original path of the incident wave. The phenomenon is called refraction. It is due to the difference in speed of sound in media.


DIFFRACTION

When sound waves originated by a vibrating source, they spread in the medium and if the medium is homogeneous, this leads to a bending of sound waves around the edges. Which is known as diffraction.
The sound waves diffracted broadly, therefore, one can easily hear the voice of another person.


Doppler’s Effect

The apparent change in the frequency of source due to relative motion between the source and the observer is called Doppler’s effect.

Applications of Doppler’s Effect


1. The measurement of Doppler shift (based on Doppler’s effect) has been        used by police to check over speeding of vehicles.
2. By Astrophysicists to measure the velocities of planets and stars.
3. At airports to guide the aircraft.
4. To study the heart and blood flow in different parts of the body.





SONAR

  • SONAR stands for Sound Navigation and Ranging. It is used to measure the depth of a sea, to locate the enemy submarines and shipwrecks.
  • The transmitter of a sonar produces pulses of ultrasonic sound waves of the frequency of about 50000 Hz. The reflected sound waves are received by the receiver.




HUMAN EAR

We are able to hear with the help of an extremely sensitive organ of our body called the ear.

There are three parts of the human ear
  • The outer ear is called pinna. It collects the sound from the surroundings.
  • The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.
  • In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve and the brain interprets them as sound.








HOPE YOUR KNOWLEDGE INCREASED FOR MUCH MORE STUFF VISIT LINKS BELOW

SCIENCE, MATHS, GEOGRAPHY, HISTORY, POLITY, QUIZ



Comments

  1. Replies
    1. Thanks for the appreciation
      Come again to visit for interesting structured content

      Delete
  2. When writing about your interests try and show how they can have some relevance to the job and make sure that you are able to talk about them enthusiastically for at least 5 minutes. essay writing

    ReplyDelete
  3. It's very difficult to stumble upon the right essay service for your college needs. That's why the best essay writing service reddit was created for troubled college students.

    ReplyDelete
  4. You can find these online or you might have some at home that you've received in the mail. If it's online, make sure that you print it out so you have a physical copy. Direct Response Copywriting

    ReplyDelete
  5. With Central Board of Secondary Education (CBSE) functioning as one of the two most important Indian boards of education, things are going to be indeed very tough, after all, this is the evaluation barometer, which decides the fate of million aspiring students. UP Board 10th Model Paper 2021

    ReplyDelete
  6. The State Government of Andhra Pradesh (AP) is fully devoted to meeting the needs of their employees quickly and easily. Rather than visiting their relevant state department offices just because they want important information such as payslip, employees can now access everything online. This is possible thanks to the DDO Request (DDOREQ) Andhra Pradesh State Treasury web portal ddo code request apcfss from where they can download their AP Payslip, GPF slip, Pension, CFMS, and DDO details. To guarantee the highest level of efficiency, the web portal is developed by the Institute of Electronics and Governance, Treasuries and Accounts Departments of AP, and the AP Technology and Services Limited. In this post, we will take you through some of the things you need to do if you’re to take full advantage of the new treasury website.

    ReplyDelete
  7. NBSE tenth Question Paper 2021 Nagaland Board of School Education (NBSE) Nagaland Responsible for the Government Examinations is an impartial High School Leaving Certificate (HSLC) Board of School Education Government of Nagaland. NBSE 10th Madhyamik Question Paper 2021 NBSE 10th Madhyamik Question Paper 2021 Students Download NBSE tenth Question Paper 2021 at Official Website 10th Public Examinations and examinations and Students in Pdf Format for All Subject Sample Paper 2021 as given below.

    ReplyDelete
  8. In the conclusion of your essay you are to summarise the major idea of the subject and make general comments to your piece of writing. paper writing service reddit

    ReplyDelete
  9. Punjab state consumers can now make PSPCL bill payment online within the due date by using a credit card, debit card, UPI, Phonepe, or Internet Banking payment gateways and get download the PSPCL bill receipt for paid transaction. PSPCL online bill If you live in the state of Punjab, then you should be pretty much familiar with the PSPCL which is well known as Punjab State Power Corporation Limited, and this is a government owned power supplying entity which ensures that all the corners of Punjab receive power and at the same time power bill payment is made on time as well.

    ReplyDelete
  10. Model Papers 2021 Download with Suggestions for HSC Model Paper 2021 Pdf Download and SSLC New Syllabus Sample Question Paper 2021 and different types of model papers and question papers for following the website Model-Paper.com and Arts, Science, Commerce Stream Subject Wise Solved Question Bank for Hindi & English Medium Students with Exam Pattern & Blueprint and subject Wise with 11th & 12th Question Bank 2021 for General & Vocational Course Languages & Subjects Important Question for the above link.

    ReplyDelete

  11. Bihar Model Paper 2022 for 12th Class Released share a huge change in the paper pattern. As per the model papers, the Students would now have 50 per cent Choice in the Model Set Paper 2022, Bihar Question Paper 2022 for Inter Exam Announced Share a huge Change in the Question Pattern. BSEB 12th Model Paper 2022 BSEB Intermediate Arts, Science, Commerce Exam will be held in two shifts, Bihar Board 12th Class Practical Exam 2022 will be held Prior to the Theory Paper in the month of January 9th, (Saturday) 2022 and January 18th, Monday 2022, Bihar Board 12th Class Arts, Science, Commerce Question Paper 2022 Pdf Available at Official Website.

    ReplyDelete

Post a Comment

Popular Posts

HISTORY (MUGHAL EMPIRE)

BABUR Descendent of Timur (from his father side) and Genghis khan (from his mother side) It is said that he was invited in India by Daulat Khan Lodi and Alam kha lodi He laid the foundation of the Mughal empire by defeating Ibrahim Lodi in the first battle of Panipat on 21, April 1526. In 1527, he defeated Rana Sanga of Mewar at Khanwa. In 1528, he defeated Medini Rai of Chaneri at Chanderi. In 1529, he defeated Muhammad Lodhi (uncle of Ibrahim Lodhi) at Ghaghra. In 1530, he died at Agra. His tomb is at Lahore. The tomb of only two Mughal emperors are outside India i.e. Babur & Bahadur Shah Zafar He was the first to use gunpowder & artillery in India. Two gun masters Mustafa & Ustad Ali were in his army He wrote his autobiography Tuzuk-i-Baburi in Turki. Tuzuk-i-Baburi was translated in Persian (named Baburnama) by Abdur Rahim Khan-e-khana & in English by Madan Bebridge. He compiled two anthologies of poems, Diwan (in Tu

POLITY (ELECTIONS)

MATH TRIGONOMETRY

The only way to learn  MATHEMATICS  is to do  MATHEMATICS Trigonometry , the branch of  mathematics  concerned with specific functions of  angles  and their application to calculations. There are six functions of an angle commonly used in trigonometry. Their names and abbreviations    sine  (sin),  cosine  (cos),  tangent  (tan),  cotangent  (cot),  secant  (sec), and  cosecant  (csc). The word  trigonometry  comes from the Greek words  trigonon  (“triangle”) and  metron (“tomeasure”). The first use of the idea of ‘sine’ in the way we use  it today was in the work Aryabhatiyam by Aryabhata,  in A.D. 500. Aryabhata used the word ardha-jya  for the half-chord, which was shortened to jya or  jiva in due course. When the Aryabhatiyam was  translated into Arabic, the word jiva was retained as  it is. The word jiva was translated into sinus, which  means curve, when the Arabic version was translated  into Latin. Soon the word sinus , also used as sine ,  became comm

MATH MENSURATION 2-D

The only way to learn MATHEMATICS is to do MATHEMATICS IF YOU HAVE KNOWLEDGE LET OTHERS  CANDLE LIGHT  IN IT https://www.correcteducate.com/2019/08/chemistry-base-and-salts.html https :// www . correcteducate . com / 2019 / 07 / root - word . html https :// www . correcteducate . com / 2019 / 07 / properties - of - quadrilaterals . html https :// www . correcteducate . com / 2019 / 07 / geography - universe . html https://www.correcteducate.com/2019/07/general-knowledge.html https://www.correcteducate.com/2019/07/vocabulary-series_29.html