Every 5,000 compounds that enter preclinical testing, how many will be approved for marketing in the United States?

A) 1
B) 5
C) 50
D) 100


Answer: A
Explanation: A) Correct. According to some estimates, for every 5,000 compounds that enter preclinical testing, only five will continue on to clinical trials in humans, and only one will be approved for marketing in the United States.
B) Incorrect. According to some estimates, for every 5,000 compounds that enter preclinical testing, only five will continue on to clinical trials in humans, and only one will be approved for marketing in the United States.
C) Incorrect. According to some estimates, for every 5,000 compounds that enter preclinical testing, only five will continue on to clinical trials in humans, and only one will be approved for marketing in the United States.
D) Incorrect. According to some estimates, for every 5,000 compounds that enter preclinical testing, only five will continue on to clinical trials in humans, and only one will be approved for marketing in the United States.

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Answer the following statement(s) true (T) or false (F)

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Indicate whether the statement is true or false

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Why can't impedances in series in an AC circuit simply be added to find the total circuit impedance?

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A laser operates on the fundamental principle that a pumped medium amplifies a travelling light beam as it propagates through the medium. Without mirrors a laser becomes a single-pass travelling wave amplifier (Figure E.26.1).


This is a system without feedback. If we now place mirrors at each end of the pumped medium, we introduce feedback into the system.

When the gain of the medium becomes large enough the system oscillates creating a coherent output light beam. That is laser operation. If the gain of the medium is less that that required to sustain oscillation, the system is known as a regenerative travelling-wave amplifier (RTWA).
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