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Palblocks are se does, machine en e flawy cr defect n the metal blocks acks (or other de obstructed. The l Fiquincy 45 hinging frequencies less 2 TThey can ale hear Rhineceres can produce Figure 4 Dogs are used for detective work by police because they can hear Sonic ultrasonic / sound and also bede they havé excellent setse of ell Figure 47. Bata can prd sounds having frequencies 20.000 Hz while screaming Ty urasonic nds having fr an internal crack fo through it. It reflec he sounds of frequencies higher than 20,000 hertz are known as' ultrasonic sounds sgund Thus, ultrasonic sounds are very high frequency sounds Ultrasonic sounds Cannes Auman beimgsThongh hma beings cannot hear ultrasonic sounds but dogs can hear ultrasound ttegney up to SO hertz.
This as the reason why dogs are used for detective work by the pr my deserts dolphins porpoises and leopard can also hear ultrasonic sounds. Bats can hear is hecipe guencies p to 12000 hertz In fact, bats can also produce ultrasonic sound Cmine N e camat hear the screams of a bat because its screams consist of ultrasonic sound k Sequence mach hügher than 20000 hertz which is beyond our limit of hearing). In addition änighins, gorges and rats can also produce ultrasonic sounds as well as hear ultrasonic sounds O mie the ae of Eve years can bear ultrasonic sounds of frequency up to 25,000 hertz.
as people, their ears become less sensitive to sounds of higher frequencies. Ultrasonic Sound cannot be prod i and binary vibrate like tuning forks. They are produced by special vibrators which can vibrate ho120.00 He. are detected by u ears are placed or Figure 49) f the ultrasound block is flaw Lrasound waves IE, however, back, then In Figure 49 (a block shown in the study. e will discuss this in detail in higher classes having hoo high frequency which cannot be heard by human beings are called ultrafine r example, a sound of frequency 100.000 hertz is an ultrasound.
earth in the direction of force applied in this the whole member not utilize in pulling the body, only the horizontal component as the than a week the formula no calculate the work done will now drive a fula to www when we today move angle that the direction of Formula for Work Done when a Body Moves at an Angle to the Direction of Suppose a helping at points being pulled by a man de Figure. on the horizontal floor and reaches en X after covering a distance, but the force pled in the direction of the string out making an angle with the direction of motion of the body along the ground. Thus, the work is done in pulling
The ultrasound is reflected e dinary sound waves and produces echoey but the echoes produced by ultrasound cannds ur a, they can anly be detected by special equipment. Due to its very high frequency much pater penetrating power than ordinary sound. So, it can be used to detedt dby ULTRASOUND ar altaund In other words, the sounds having a frequency greater than 20,000 hertz are for humans.
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