Ultrasound and infrasound differ from “ordinary” sounds in three distinct ways that influence all the considerations of this chapter. Question: Let us compare speed of sound and speed of light in air?. Sound can travel through: (a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases 2. ultrasonic sounds have a frequency above the upper limit of human hearing. ... Sound Class 8 Extra Questions Higher Order Thinking Skills. ... Ultrasonic Sound has a frequency greater than the audible frequency range. Write the difference between infrasonic and ultrasonic sound? 4. Question: Why speed of sound is more on a humid day as compared to a dry day?. A. The sounds of frequency less than 20Hz are called infrasonics. The sound of frequency more than 20,000Hz are called ultrasonics. Answer: Ultrasonic sound: Infrasonic sound (i) Sound of frequency higher than 20,000 Hz is called ultrasonic sound. 1. Explain the difference between infrasonic, ultrasonic, and audible sounds. 2 See answers mohansubha62 mohansubha62 Answer: Infrasound is sound that is below the lower limit of human hearing, below 20 Hz, and ultrasound is above the upper limit of human hearing, above 20,000 Hz. The effect of this allows the brain to detect the phase difference between the two frequencies, rather than the brain responding to each frequency, the effect comprises of the difference between the two. Ans: Low frequency sounds below 20 hertz which we cannot hear are called infrasonic, whereas high frequency sounds above 20,000 hertz which also cannot be heard by us are called ultrasonic. Infrasonic Sound Infrasonic is applied to sound that refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20 Hz. CBSE Class 8 Science Chapter 13 Extra Questions. Infrasonic, is sometimes referred to as low-frequency sound, this sound is lower in frequency than 20 Hz (hertz) or cycles per second, the "normal" limit of human hearing. 2. State the differences between ultrasonic sound and infrasonic sound? If the first overtones are produced in each organ pipe, find the ratio of the lengths of the two organ pipes. (a) Baby girl (b) Baby boy (c) A man (d) A woman 3. 3. (i) Sound of frequency lower than 20 Hz is called the infrasonic sound. Sound waves travel fastest ... Read more Grade 8 Sound Worksheets What do you mean by audible sound? Distinguish between infrasonic and ultrasonic. Question 1. What are the differences between ultrasonic sound and infrasonic sound? Important Questions for Class 8 Science Chapter 13 sound- Download Free PDF. Voice of which of the following is likely to have minimum frequency? What is frequency? Answer: Light travels faster than sound. The infrasonic sounds have below the lower limit of human hearing. 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