l) শব্দের তীব্রতার নিরাপদ সীমা হল -
(a) 65 dB, (b) 60 dB, (c) 90 dB,
(c) 90 dB, (d) 100 dB
(a) তির্যক তরঙ্গ, (b) তড়িৎচুম্বকীয় তরঙ্গ,
Answers
Answered by
2
Answer:
60 db frnd
Explanation:
hiii i am bengali
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Bengali se mat poocha karo yaar
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