Intro Spectroscopy
5th Edition
ISBN: 9781305221796
Author: PAVIA
Publisher: Cengage
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Why is infrared spectrophotometry a goodmethod for identifying a pure chemical substance,whereas UV-visible spectrophotometry is seldomused for this purpose?
At 293 K, the Bragg angle for X-ray peak (111) from a powdered gold metal specimen is 38.30o. If the same peak is detected at 493 K, calculate the angle. Assume gold metal has a coefficient of linear thermal expansion of 14.2 x10-6 K-1 and a length of 0.47 nm for its standard FCC unit cell.
An APD has a quantum efficiency of 50% at a wavelength of 500 nm in the absence of multiplication. If the
device is operated with a reverse bias to give a multiplication factor of 8. Calculate:
a. responsivity.
b. the photocurrent of the APD if the incident optical power is 4 μW.
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