The Balmer series of emission lines from hydrogen lie in the ________ part of the EM spectrum
a. near infrared b. infrared
c. visible d. ultraviolet
c
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A protostar of 20 solar masses should form a star that will stay on the main sequence twenty times longer than our Sun
Indicate whether the statement is true or false
In globular clusters, the brightest stars will be:
A) massive blue main sequence stars. B) red supergiants. C) T Tauri stars. D) blue stragglers. E) planetary nebulae.
On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to a temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/(m K). Determine the heat loss through the wall, which is 10-m long and 3-m high.
GIVEN
10 m long, 3 m high, and 0.2 m thick concrete wall
Thermal conductivity of the concrete (k) = 1.2 W/(m K)
Temperature of the inner surface (Ti) = 20°C
Temperature of the outer surface (To) = –5°C
FIND
The heat loss through the wall (qk)
ASSUMPTIONS
One dimensional heat flow
The system has reached steady state
SKETCH
A diffraction grating has 300 lines per mm. If light of wavelength 630 nm is sent through this grating, what is the highest order maximum that will appear?
A) 8 B) 2 C) 6 D) 5 E) 5.3