A longer pulse length will excite a: A: ) narrower range of frequencies. B: ) broader range of frequencies. C: ) range of frequencies equal to the pulse time.

The difference between a histogram and a frequency polygon is: A: the frequency polygon is reported as a percent, a histogram does not report percents. B: the histogram shows frequencies while a frequency polygon shows cumulative frequencies. C: the bars in a histogram and a frequency polygon cannot be adjacent. D: open-ended classes can be accommodated with a frequency polygon.

Function hist() can be used to obtain the frequencies.（）

4. To fix the frequency boundaries of relatively high gain, 0.7 Amid was chosen to be at the cutoff levels. The corresponding frequencies, f1 and f2, are generally called ________. A) corner frequencies B) cutoff frequencies C) half-power frequencies D) All of the above A: wrong. B: wrong. C: wrong. D: This is the right answer.

A filter that attenuates high frequencies while passing low frequencies is called a（ ）. A: bandpass B: bandstop C: lowpass D: highpass

. Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone? A: 2187.5 kHz B: 2174.5 kHz C: 2182kHz D: 2177. OkHz

The sum of the relative frequencies for all classes will always equal:

中国大学MOOC: Recombination frequencies can be calculated by

智慧职教: How are paired NBDP frequencies normally used?

The sum of frequencies for all classes will always equal 1. (<br/>)