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 atmosphere does reflect radio-wave from the earth back into space?
A Stratosphere
B Thermosphere
C Mesosphere
D Ionosphere
The layer of atmosphere which reflects radio waves is
A Ionosphere
B Troposphere
C Stratosphere
D Exosphere
When an object enters earths atmosphere, it travels ----
A very repidly
B in a rapid manner
C fastly
D rapidly
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 of the following reflects radio waves back to the Earth?
A Ionosphere
B Thermosphere
C Tropopause
D Mesopause
Which layer of of atmosphere contains the ozone layer?
A Mesosphere
B Stratosphere
C Troposphere
D Thermosphere
A satellite that simply reflect back the signals from one region of the earth to the other region is known as
A Orbiting satellite
B Geostationary satellite
C Active satellite
D Passive satellite

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