CHOOSE THE BEST ANSWERS Over the last 500 years, 34 amphibia…

CHOOSE THE BEST ANSWERS Over the last 500 years, 34 amphibian species have gone extinct out of 6,400 known amphibian species. The background extinction rate is the rate at which species go extinct during the interludes between mass extinction events. On average, the background extinction rate for amphibians is 2 extinctions per 10,000 species per 100 years. Based on the background extinction rate, how many amphibians would be expected to have gone extinct over the last 500 years? [Expected] How does the observed number of extinctions compare to the expected number of extinctions? [Observed]

3 c.) If  each of the amplifiers has 23 dB of gain, and each…

3 c.) If  each of the amplifiers has 23 dB of gain, and each filter has 2 dB of insertion loss in their pass band, what is the conversion gain/loss of this entire system (from the input of the first amplifier to the IF output? (Ignoring cable and any reflection loss).   (Pick closest answer ) 

For all parts of Problem 3, assume the receiver above, with…

For all parts of Problem 3, assume the receiver above, with the mixer specs as given in the table. Assume further that for all parts (except where may be indicated otherwise) the LO frequency is set to 4150 MHz at +7dBm input power and the RF frequency is 4.2 GHz .