16th April
World Voice Day
विश्व आवाज दिवसMessage 2023 :
"Let's take good care of our voices because they enable us to express our ideas to others around us"
To demonstrate the enormous importance of the voice in the daily lives of all people.
By 2002, the American Academy of Otolaryngology-Head and Neck Surgery officially recognized the celebration which earned it the title of World Voice Day.
SSC PYQ related to SOUND•In Vaccum sound cannot travel.
•The quality depends primarily on the waveform of the sound.
•Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz
•Infrasonic <20Hz to 20 kHz< Ultrasonic
•Bats are good at flying at night because they use ultrasonic sound rather than sight to navigate.
•Frequency of sound is measured in hertz (Hz).
•Speed of Sound = wavelength × frequency
•SONAR stands for Sound Navigation And Ranging.
•Reflection of sound - Echo ( Min. 17m distance )
