Announcements:
No Labs this week.
Review Session this evening 7:30=-9:30
For exam: Review HW, Tutorialsx2, Labsx2, quiz. Don't eat too much before...
Formula page, as it will appear on the exam:
Here are some quantities and relationships that you might find useful:
for a wave: speed = wavelength x frequency
the speed sound in air: cs = 340 meter/sec
the speed of light: c = 3 x 108 meter/sec
for light waves: energy = h x frequency = h x c/wavelength
Planck's constant: h = 6.626 x 10-34 Joule
x sec
Doppler formula:
speed of emitter change
in frequency
------------------- = --------------------
speed of wave
rest frequency
wavelength of spectrum peak (in nanometers) =(3 x 106
nm K)/temperature
for blackbody emitters: intensity = sigma x temperature4
sigma = 5.67 x 10-8 W/(m2 K4)
luminosity = intensity x surface area, or: Intensity
= luminosity/area.
for a sphere: surface area = 4 x pi x radius
magnitude scale: difference of one magnitude corresponds
to a factor of ~2.5 in intensity
distances: 1 Astronomical Unit (1 earth-sun distance)
= 1.495 x 1011 meter
luminosity (power!) of the sun: 1 Lo = 3.8
x 1026 Watt
1eV = 1.609 x 10-19 Joule
Regarding subject matter:
In progress |
