Related Questions

Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A i only
B ii only
C both i & ii
D neither i nor ii
Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?
A Ionosphere
B Stratosphere
C Mesosphere
D Exosphere
Which of the following reflects radio waves back to the Earth?
A Ionosphere
B Thermosphere
C Tropopause
D Mesopause
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A 3, 3, 1, 7
B 3, 2, 1, none
C 3, 2, 1, 7
D 3, 3, 2, none
E All of the above
দুটি সুসঙ্গত উৎস থেকে λ দৈর্ঘ্যের দুটি তরঙ্গ সমদশায় বের হয় । একটি বিন্দুতে যেখানে তরঙ্গ দুটি মিলিত হয় সেখানে তাদের দশা পার্থক্য 90° । তরঙ্গ দুটির অতিক্রান্ত পথ পার্থক্য তখন কত ? ( Two coherent sources emit waves of wavelength λ which are in phase. which are in phase. The two waves meet at a point where they have a phase difference of 90°. Which of the following could be the traversed path difference between the waves?)
A 2λ
B λ
C λ/2
D λ/4
Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?
A Troposphere
B Stratosphere
C Mesosphere
D Ionosphere
Which layer of atmosphere does reflect radio-wave from the earth back into space?
A Stratosphere
B Thermosphere
C Mesosphere
D Ionosphere
Which layer of of atmosphere contains the ozone layer?
A Mesosphere
B Stratosphere
C Troposphere
D Thermosphere
The manager of a radio program is going to feature six vocalists--M,N,P,Q,R and S on her half hour radio show during the course of one week.She will feature one vocalist on the show each day from Monday through Saturday.The manager must schedule the vocalists for the show according to the following conditions: *M must be featured earlier in the week than R. *P must be featured on Tuesday. * Q must be featured on the day immediately before or immediately after the day on which N is featured. If N is to be featured on Thursday, the earliest day on which R can featured is ---
A Monday
B Tuesday
C Wednesday
D Friday
The manager of a radio program is going to feature six vocalists--M,N,P,Q,R and S on her half hour radio show during the course of one week.She will feature one vocalist on the show each day from Monday through Saturday.The manager must schedule the vocalists for the show according to the following conditions: *M must be featured earlier in the week than R. *P must be featured on Tuesday. * Q must be featured on the day immediately before or immediately after the day on which N is featured. If Q is to be featured on Thursday, the latest day on which M can featured is ---
A Monday
B Tuesday
C Wednesday
D Friday

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