Questions and Correct Answers |
Latest Version 2024/2025
Hand Cupped Behind Ear - ANSWER --first Hearing Aid
-increased sound by 5-8db
-included horns,trumpets, speaking tubes
1892 - ANSWER --carbon amplifiers patent by Alexander Bell
-marketed 1902-1903 until 1930;first patent for a telephone type hearing instrument
1920 - ANSWER -large vacuum tubes; not portable
1938 - ANSWER -miniature vacuum tube ;crystal receivers
1930 - ANSWER -diameter reduced
1940 - ANSWER -bone conduction receivers were introduced
1946 - ANSWER -first telecoil introduced
1950 - ANSWER -bodyworn HA became convenient size
1948 - ANSWER -transistor invented
1954 - ANSWER -eyeglasses aids introduced
1974 - ANSWER -microphones electrets were introduced
1964 - ANSWER -intergrated circuit(transistors, resistors, wiring...)
1952 - ANSWER -first transistors
The Most Important function of the oval window is to : - ANSWER -transfer vibration from the
ossicular chain
Hair Cells a rise from the layer on top of the : - ANSWER -organ of corti
The theory of hearing that is considered the most accurate is : - ANSWER -Place Theory, Volley
Theory, Temporal Theory
The Three semicircular canals are: - ANSWER -1)90degress angle to one another
2)superior,posterior, and lateral
3)detectors of rotational movement in any direction