In a single-slit experiment, light of wavelength 500 nm is used to produce a diffraction pattern on a screen 4.0 m away. If the distance between both 3rd order minima is 6.0 cm, what is the slit width?
a. 
b. 
c. 
d. 
e. 
a.
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Where are the X-rays produced that are emitted by quasars and other active galactic nuclei?
A) in the hot gas in an accretion disk around a central black hole B) in dust grains in molecular clouds that encircle the active galactic nucleus C) in an ionization nebulae of interstellar gas surrounding the accretion disk D) in fast-moving jets of electrons that are ejected from the active galactic nucleus E) all of the above
Resistors in Combination: What different resistances can be obtained by using two 2.0-? resistors and one 4.0-? resistor? You must use all three of them in each possible combination.
What will be an ideal response?
Under steady state conditions, a piece of wood 350 mm by 350 mm and 15 mm thick conducts heat through its thickness and loses no appreciable heat through its well-insulated sides
The rate of heat flow is measured to be 14.0 W when the temperature difference across its thickness is 28°C. Determine the thermal conductivity of this wood. A) 9.2 × 10-4 W/(m ? °C) B) 270 W/(m ? °C) C) 16 W/(m ? °C) D) 0.061 W/(m ? °C) E) 33 W/(m ? °C)
Quasar's spectral lines are:
A) emission lines with large redshifts. B) a continuum from the synchrotron radiation. C) fuzzy absorption lines from the merged light of the billions of stars. D) too complex for any interpretation. E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen.