The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc
a. True
b. False
Indicate whether the statement is true or false
False
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If molecules in the sky scattered red-orange light strongly instead of blue light, sunsets would be
A) orange. B) yellow. C) green. D) blue.
A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?
a. at the 40-cm mark b. at the 45-cm mark c. at the 50-cm mark d. at the 55-cm mark e. at a position not given
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2 . The angle of reflection of that ray from mirror 2 is a. 0°
b. 30°. c. 60°. d. 90°. e. 120°.
A nearsighted person has a far point of 2.0 m. Neglecting eye-lens distance, what power lens would allow good distant vision?
1.2.0 diopters 2.0.50 diopter 3.–2.0 diopters 4.–0.50 diopter