ILE Exam Hearing Aids(Correctly Answered)2023

Hand Cupped Behind Ear >>-first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 >>-carbon amplifiers patent by Alexander Bell -marketed 1902-1903 until 1930;first patent for a telephone type hearing instrument 1920 >>large vacuum tubes; not portable 1938 >>miniature vacuum tube ;crystal receivers 1930 >>diameter reduced 1940 >>bone conduction receivers were introduced 1946 >>first telecoil introduced 1950 >>bodyworn HA became convenient size 1948 >>transistor invented 1954 >>eyeglasses aids introduced 1974 >>microphones electrets were introduced 1964 >>intergrated circuit(transistors, resistors, wiring...) 1952 >>first transistors The Most Important function of the oval window is to : >>transfer vibration from the ossicular chain Hair Cells a rise from the layer on top of the : >>organ of corti The theory of hearing that is considered the most accurate is : >>Place Theory, Volley Theory, Temporal Theory The Three semicircular canals are: >>1)90degress angle to one another 2)superior,posterior, and lateral 3)detectors of rotational movement in any direction The average length of an uncoiled basilar membrane is >>35mm