1. A 5mW laser puts out a narrow beam of 2mm indiameter. What are the average va
ID: 1678138 • Letter: 1
Question
1. A 5mW laser puts out a narrow beam of 2mm indiameter. What are the average values of the B and E in thebeam? 2. Fill in response: a. Electromagnetic waves travelat the speed of __________ b. Electromagnetic waves carry________ and _______ c For EM wave, the ratio E/B is1/ _________, what are the constants under thesquare root d. A 60hz frequency EM wavewill have a wavelength ___________km. e. EM waves propogate in a direction whiichis ____________ to the electric and magnetic field theycarry. (along, parallel, perpandicular, across) 1. A 5mW laser puts out a narrow beam of 2mm indiameter. What are the average values of the B and E in thebeam? 2. Fill in response: a. Electromagnetic waves travelat the speed of __________ b. Electromagnetic waves carry________ and _______ c For EM wave, the ratio E/B is1/ _________, what are the constants under thesquare root d. A 60hz frequency EM wavewill have a wavelength ___________km. e. EM waves propogate in a direction whiichis ____________ to the electric and magnetic field theycarry. (along, parallel, perpandicular, across)Explanation / Answer
1. A 5mW laser puts out a narrow beam of 2mm indiameter. What are the average values of the B and E in thebeam?area=*1*10-6
intensity=power/area=5*10-3/3.14*10-6=1591.5w/sqm=E2/co
where E=rms value
E/B=c
hence B can be calculated.
and c=3*108m/sec
and 0=4*3.14*10-7
2. Fill in response: a. Electromagnetic waves travelat the speed of __3*108m/sec________ b. Electromagnetic waves carry____electric ____ and _ magnetic fields______ c For EM wave, the ratio E/B is1/ oo_________, what are the constantsunder the square root d. A 60hz frequency EM wavewill have a wavelength _C/60=5*104__________km. e. EM waves propogate in a direction whiichis _perpendicular___________ to the electric and magneticfield they carry. (along, parallel, perpandicular, across)
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