ANALYTICAL METHODS [LIGHT AND ENERGY]

Question 1

Transmitted via electromagentic waves.

Answer 1

Energy

Question 2

What are the two factors that characterizes energy?

Answer 2

Frequency and Wavelength

Question 3

This is the distance between two sucessive peaks.

Answer 3

Wavelength

Question 4

What is the unit used for wavelength?

Answer 4

Nanometer (nm)

Question 5

How many nanometers are the following: Visible, UV, and Infrared.

Answer 5

Below 400nm = UV, 400-700nm = Visible Spectrum, Above 700nm = Infrared Spectrum

Question 6

These are the number of vibrations of wave motion per second.

Answer 6

Frequency

Question 7

Wavelengths are (?) related to frequency.

Answer 7

Inversely Related

Question 8

The lower the (?), the longer the (?).

Answer 8

The lower the frequency, the longer the wavelength.

Question 9

This formula describes the relationship between wavelength and energy.

Answer 9

Planck’s Formula

Question 10

What is the equation for the Planck’s Formula?

Answer 10

E= hv

Question 11

What does the variables in the Planck’s Formula correspond to?

Answer 11

(E) is photon energy in Joules or eV.
(h) is a constant [6.620x10^-34 erg sec.].
(v) is frequency.

Question 12

The peak transmittence of a wavelentgh.

Answer 12

Nominal Wavelength

Question 13

True or False: A slight error in wavelength adjustment is negligible to the absorbance readings.

Answer 13

False, even the slightest error in adjustment will introduce significant errors.

Question 14

The indicated wavelength in the control dial represents the actual wavelength of light via the monochromator.

Answer 14

Wavelength Accuracy

Question 15

What kind of filter is used to check the accuracy of a wavelength.

Answer 15

Didymium or Holmium Oxide Filter

Question 16

This filter or solution is used to verify the absorbance linearity.

Answer 16

Neutral Density Filters or Dichromate Solution