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500 kHz: Quiz

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Question 1: For most of its history, the international distress frequency was referred to by its equivalent ________, 600 meters, or, using the earlier frequency unit name, 500 kilocycles [per second] or 500 kc.
DiffractionLightElectromagnetic radiationWavelength

Question 2: ________ for emergency frequencies in current use.
SOSMorse codeDistress signalCQD

Question 3: Many ________ calls and medical emergencies at sea were handled here until the late 1980s.
Distress signalSOSCQDMorse code

Question 4: To facilitate communication between operators speaking different languages, standardized abbreviations were used including a set of "________" specified by the 1912 Service Regulations.
Continuous waveMorse codeQ codeAmateur radio

Question 5: Since early in the 20th century, the radio frequency of 500 kilohertz (500 kHz) has been an international calling and distress frequency for ________ maritime communication.
Morse codeISO/IEC 8859-16ISO/IEC 8859-13ISO/IEC 8859-3

Question 6: The nearby frequencies of 518 kHz and 490 kHz are used for the ________ component of GMDSS.
Automatic Identification SystemGlobal Maritime Distress Safety SystemAMTORNavtex

Question 7: There have been proposals to allocate frequencies at or near 500 kHz to ________ use.
D-STARCitizens' band radioAmateur radio repeaterAmateur radio

Question 8: The ________ and comparable agencies of other nations used to maintain 24 hour watches on this frequency, staffed by highly skilled radio operators.
United States Marine CorpsUnited States NavyUnited States Coast GuardUnited States armed forces

Question 9: International standards for the use of 500 kHz were expanded by the Third International Radiotelegraphic Convention, which was held after the sinking of the ________.
White Star LineHMHS BritannicRMS OlympicRMS Titanic

Question 10: Communication was generally conducted in ________, initially using spark-gap transmitters.
ISO/IEC 8859-3Morse codeISO/IEC 8859-16ISO/IEC 8859-13







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