The number of significant figures a common ruler can measure is
A) zero.
B) one.
C) three.
D) five.
E) seven.
C
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Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?
a. emission nebulae b. H I c. reflection nebulae d. dark nebulae e. spectral type B6
Consider the following circuits. Two identical batteries are connected to two identical inductors as shown. The switches are closed for a very long time
The following are positioned in sequence: A source of a beam of natural light of intensity I0; three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, from the perspective of the observer
The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. Which of the following pairs of angles are possible axis angle settings of polarizer B? A) 90° and 130° B) 90° and 140° C) 40° and 130° D) 40° and 90° E) 40° and 140°
Which of following statements about the image formed by a single diverging lens are true? (There could be more than one correct choice.)
A) The image is always real. B) The image is always virtual. C) The image is always inverted. D) The image is always upright. E) The image is always smaller than the object.