Lecture 7:Spectroscopy & Astrophysics

Question 1

List the type of rays in order starting from lowest wavelength to highest wavelength

Question 2

Thermal energy comes from kinetic energy of its internal particles. The greater its thermal energy, the hotter the object is

Question 3

A blackbody is an ideal object that does not reflect any light and thus emits electromagnetic radiation in all wavelengths entirely as a result of its
temperature

Question 4

Blackbody radiation: it refers to the light emitted by a blackbody

Question 5

Wein’s law: The blackbody radiation consists of a continuous spectrum that peaks at a certain wavelength (or frequency

Question 6

Peak of blackbody radiation = wavelength of maximum emission =>
wavelength at which the object looks brightest (gives colours to objects)

Question 7

Stefan-Boltzmann’s law: The higher an object’s temperature, the more intensely the object emits electromagnetic radiation at all wavelengths and
the shorter the wavelength at which it emits most strongly

Question 8

Explain Kirchoff’s three laws to do with the line spectrum of objects.

Question 9

Explain the Lyman, Balmer, Paschen series of electron transitions

Question 10

What is doppler effect?
When is blue shift seen when is red shift seen?