20 Hz Se Kam Avriti Ko Kya Kehte Hain ? 20 Hz से कम आवृत्ति को क्या कहते हैं?
20 Hz से कम आवृत्ति को क्या कहते हैं?
और 20,000.से ऊपर की अल्ट्रासोनिक तरंगें
Comments Sumit Pareek on 26-03-2014 manish diwakar on 26-03-2014
Right
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madan godara on 25-03-2014
Ryt
20000 हर्ट्ज से ऊपर 20 हर्ट्ज के अंत में श्रव्य तरंगें होती हैं
And 20 hz se uper 20000 hz tk audible wabes
इन्फ्रासोनिक तरंगें
PINKU YADAV on 23-03-2014
Infrasonic waves
Alex Dragov on 22-03-2014
Or 20,000 se upar ultrasonic waves
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