The design of modern X-ray telescopes depends on:
A) lenses made of germanium.
B) the prime focus design, with mirrors made of iron.
C) grazing incidence optics.
D) achromatic lenses to keep the X-rays in focus.
E) the Cassegrain design, with mirrors made of lead.
C
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The rotation of the Sun's photosphere is
a. fastest at the equator, slower at mid-latitudes, and slowest near the poles. b. slowest at the equator, faster at mid-latitudes, and fastest near the poles. c. fastest at the equator, slowest at mid-latitudes and the poles which travel at the same speed. d. the same regardless of latitude.
The Earth's axis is always tilted at an angle of _________ degrees to the plane of the ecliptic.
What will be an ideal response?
Mario Molina and Sherwood Rowland received the 1995 Nobel Prize for
A) their efforts to control chemical warfare. B) their efforts to control nuclear weapons. C) their experiments and theories concerning the chemical basis for atmospheric ozone depletion. D) their discovery of new ways to make the electronic portion of the electromagnetic spectrum more useable by all the people of the world. E) their experiments and theories concerning the chemical basis for global warming.
If the ground state energy level of an electron in a rigid box is 5.0 eV, what is the width of the box?
A) 2.3 × 10-11 m B) 7.3 × 10-20 m C) 2.7 × 10-10 m D) 1.0 × 10-10 m E) 9.1 × 10-21 m