Quiz 4

Choose the correct answer

An oscilloscope has its volts/cm knob set at 0.2v/cm and its time /cm knob set at 0.2millisec/cm. If the AC waveform on the screen had a height = 8.4cm and a width = 2.6cm, solve the following:a. The frequency of the waveform b. The peak voltage

An oscilloscope screen produces the waveform shown. The vertical blocks represent 20 V per division, and the horizontal blocks represent 100 us per division. What would the frequency of the displayed waveform be? O a) 1.25 kHz O b) 2 kHz Oc) 1 kHz O d) 10 kHz

Discussion 1. It is required to draw a sine wave signal of amplitude 12 volts P.P and frequency of 2 KHz on oscilloscope having voltage scale of 2 volts/cm and time base scale of 0.125 m sec / cm. Draw it on your lab paper. 2. It is required to draw a sine wave signal of amplitude 8 volts P.P and frequency of 2 KHz on ocilloscope having voltage scale of 2 volts/cm and time base scale of 0.125 u sec / cm. Draw it on your lab paper. 3. It is required to draw a sine wave signal of amplitude 4 volts P.P and frequency of 1 KHz on oscilloscope having voltage scale of 2 volts/cm and time base scale of 1 um sec / cm. Draw it on your lab paper.

The attached waveform VS displayed on the oscilloscope approximate the following quantities.1. The peak voltage.2. The peak-to-peak voltage.3. The frequency of the waveform.4. The difference in time that corresponds to a 72 degree phase shift for this waveform. How would use of an osciloscope aid in solving this problem?

In a fluorescence-lifetime experiment, a very short pulse of light is used to excite a sample. Then the intensity of the fluorescence is recorded as a function of time. Suppose we study a dansyl fluorophore. The intensity of the fluorescent light versus time is as follows: Fluorescence intensity Time (ns) 1.1 x 104 4.9 x 103 5 2.3 x 103 10 1.3 x 103 15 5.6 x 102 20 Part A What is the observed fluorescence lifetime? Express your answer to two significant figures and include the appropriate units. T = 6.9 ns Submit Previous Answers Correct Part B The fluorescence quantum yield under the same conditions was determined to be 0.7. What is the intrinsic rate constant for radiative fluorescence decay? Express your answer to two significant figures and include the appropriate units. НА ? Value TO Units Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part C It has been determined separately that when the dansyl chromophore is 20 A away from the 11-cis-retinal…

An oscilloscope has 10 divisions across the screen.   How do you set the timebase  (sec/div) so that one cycle of a 100 Hz signal is displayed across the entire screen?

What do these buttons mean on an oscilloscope?