A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a distance of 200 km. Considering the surface wave propagation, what is the approximate height of the transmitting antenna required for efficient communication if the earth's radius is 6400 km?
96 m
192 m
384 m
768 m
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In ruby laser, the stimulated emission is due to transition from
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In ruby laser, the stimulated emission is due to transition from
Ground state to excited state
Metastable state to ground state
Excited state to metastable state
Excited state to ground state
