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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…

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.

True or Flase Light emitting diode, LEDs, with colors  with different wavelength acts as source of lights but not the laser.

The waveform displayed on an oscilloscope is as shown in Figure 3. The 'time/cm' switch is set to 2 ms/cm, and the 'volts/cm' switch is set to 0.5 V/cm. Determine: (i) amplitude of waveform Q (ii) peak to peak value of waveform P P (iii) frequency of waveform P (iv) angular frequency of waveform Q and (v) phase angle difference between P and Q in Degrees. 主 24°C Type here to search

If a semiconductor is transparent to light with a wavelength longer than 0.87 μm, determine its band gap energy.

Why does 5G mmWave require more cells to achieve a better signal

The band structure of germanium (Ge) is illustrated below showing theconduction and valence bands.   Question: Can Germanium be used as an efficient light emitting source?Explain your reasoning

A cathode ray oscilloscope (CRO) can display AC signals a. DC signals b. both AC and DC signals C. none

What is the color of a light produced by a laser which has a period of 1.60×10-15 sec. (show all the steps in your calculation) Paragraph V B I Uv A Ev 00 +v

The radiation resistance of a circular loop of one turn is 0.01 ohm. Theradiation resistance of five tums of such a loop will be.

For a certain photodiode at a given irradiance, the reverse resistance is and the reverse voltage is 10 V. What is the current through the device?