18. The following data show the values of the speed of sound in m/s) through
medium A, B, C and D:
Medium
Speed of Sound (m/s)
А
3000 (m/s)
B
330 (m/s)
с
0 (m/s)
D
1500 (m/s)
6)
Why is the speed of sound through medium C 0(m/s) ?
(ii) Identify the most probable physical state of A. Give reason for your
answer
(ii) Which of the four media could be 'air?
1+(2+1)+=3
निम्न आंकड़े माध्यम A, B, C और D में ध्वनि की गति के मान (m/8 में) बताते हैं
Answers
Answer:
A sound wave is a pressure disturbance that travels through a medium by means of particle-to-particle interaction. As one particle becomes disturbed, it exerts a force on the next adjacent particle, thus disturbing that particle from rest and transporting the energy through the medium. Like any wave, the speed of a sound wave refers to how fast the disturbance is passed from particle to particle. While frequency refers to the number of vibrations that an individual particle makes per unit of time, speed refers to the distance that the disturbance travels per unit of time. Always be cautious to distinguish between the two often-confused quantities of speed (how fast...) and frequency (how often...).
Since the speed of a wave is defined as the distance that a point on a wave (such as a compression or a rarefaction) travels per unit of time, it is often expressed in units of meters/second (abbreviated m/s). In equation form, this is
speed = distance/time