Quiz 14: Sound

Physics & Astronomy

The buzzing sounds of the flying insects are due to the rapid motion of the wings of the insect. For example, honey bees flap their wings 11,400 times per minute, resulting in a large buzzing sound. If the frequency of flap of wings is in the audible range that is from img ,, then those sounds will be audible to us. Otherwise, they are not audible even if the frequency of flapping is very high. Therefore, it is confirmed that flapping of wings of some insects produce sounds will be audible to us.

Speed of the sound wave depends upon the temperature of the particular medium. By increasing in the temperature img , the speed of sound increases by about img and it can be expressed mathematically as, img (a) Speed of sound with rise of temperature is, img Substitute img for img in the above equation. img Therefore, the velocity of sound at img is img . (b) Speed of sound with rise of temperature is, img Substitute img for img in the above equation. img Therefore, the velocity of sound at img is img .

Audible sound frequency ranges from img to img . Sound with frequency greater than img is called ultrasonic. Supersonic is a wave which has a speed greater than that of the sound. Therefore, the options (a), (c), and (d) are incorrect. Infrasonic sound frequency is below img .therefore, sound wave with frequency of img is in the region of infrasonic sound. Therefore, the correct answer is option (b).

There is no answer for this question