The ruby maser has been preferred to the ammonia maser for microwave amplification, because the former has:

The ruby maser has been preferred to the ammonia maser for microwave a

1.	The ruby maser has been preferred to the ammonia maser for microwave amplification, because the former has:
A.	A much greater bandwidth
B.	A better frequency stability
C.	A lower noise figure
D.	No need for a circulator
Answer» B. A better frequency stability

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The ruby maser has been preferred to the ammonia maser for microwave amplification, because the former has:

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