The energy level diagram for hydrogen
The energy of the most energetically possible photon emitted is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.
e
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When a hard rubber rod is given a negative charge by rubbing it with wool:
A) positive charges are transferred from rod to wool B) negative charges are transferred from rod to wool C) positive charges are transferred from wool to rod D) negative charges are transferred from wool to rod E) negative charges are created and stored on the rod
What is the primary reason that we launch X-ray telescopes into space rather than building them on the ground?
A. It is less expensive to launch them into space. B. On the ground, there would be too much light pollution from nearby cities. C. Atmospheric turbulence blurs X-ray images too much. D. X-rays from space do not reach the ground.
A Venturi tube may be used as the inlet to an automobile carburetor. If the inlet pipe of 2.0-cm diameter narrows to 1.0-cm diameter, what is the pressure drop in the constricted section for airflow of 4.0 m/s in the 2-cm section? (Assume air density is 1.25 kg/m3.)
a. 70 Pa c. 100 Pa b. 84 Pa d. 150 Pa
What condition is necessary in an interstellar gas cloud for it to begin collapsing?
A) a low density B) a low temperature C) a high temperature D) a high heavy element content E) a low heavy element content