#1 Consider the following statements: 1. A flute of smaller length produces waves of lower frequency. / 2. Sound travels in rocks in the form of longitudinal elastic waves only. Which of the statements given above is/are correct?
#2 Consider the following statements about ultrasonic waves: 1. They can destroy insects 2. They can clean clothes by removing dust 3. They can be used to treat disease 4. They can control automatic doors Of the above statements –
#3 Ultrasonics are sound waves of frequency
Ultrasonic Sound. The term “ultrasonic” applied tosound refers to anything above the frequencies of audible sound, and nominally includes anything over 20,000 Hz. Frequencies used for medical diagnosticultrasound scans extend to 10 MHz and beyond.
#4 A biotechnique in which ultrasonic sound is used-
Ultrasound, also called ultrasonography, in medicine, the use of high-frequencysound (ultrasonic) waves to produce images of structures within the human body.Ultrasonic waves are sound waves that are above the range of sound audible to humans.
#5 Bats can fly during dark nights and also prey. This is because-
Bats use a method of communication known as echo location to negotiate their way through the air and also to hunt their prey that mainly consists of insects. By sendingout a series of sound waves that are bounced off objects the bats are able to locate their prey and also move freely through the air.