Definea) Echob) infra Sound.

1.	Definea) Echob) infra Sound.
Answer» Answer: a) An ECHO answer or echo RESPONSE is a way of answering a polar question without USING words for yes and no. The verb used in the question is simply echoed in the answer, negated if the answer has a negative truth-value. b) Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. Investigations of COMPLAINTS of low-frequency NOISE often fail to measure any significant noise. Mark me Brainliest!!! : )

Answer»

Answer:

a) An ECHO answer or echo RESPONSE is a way of answering a polar question without USING words for yes and no. The verb used in the question is simply echoed in the answer, negated if the answer has a negative truth-value.

b) Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. Investigations of COMPLAINTS of low-frequency NOISE often fail to measure any significant noise.

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