(e) Given that the sun is 1.50x10 Km away and light travels a (2 marks) distance
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Question
(e) Given that the sun is 1.50x10 Km away and light travels a (2 marks) distance of 17987520Km per minute, how long does it takes for light to travel from the sun to the earth? Present your answer in minutes. (f) The radio frequency range that is typically used for radio communications spans from 3KHz to 300GHz. It is divided into bands shown in Table 3.1 of your course material (Unit 3, page 6) i. From the table, find the frequency range for VHF. (2 marks) ii. List two applications of VHF. You may look up the (2 marks) answers from the internet or from books. (g) List down the two types of wave motion and briefly describe (4 marks) each of them.Explanation / Answer
E) SPEED = 17987520 Km / Minute , Distance = 1.50 *10^8
Time = Distance/ Speed
Time = 8.34 Min
F)
i) VHF Band - 30–300 MHz
ii) This band is use to TV Broadcast, Mobile communication etc.
G) Two type of baic mechanical wave motion are:
i) Longitudinal Waves : In longitudinal wave the particle movement is parallel to wave propogation.
ii) Transverse Waves: In transverse wave the particle movement is perpendicular to wave propogation.
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