After an electron has been accelerated through a potential difference of 0.15 kV, what is its de Broglie wavelength? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 0.10 nm
B) 1.0 nm
C) 1.0 mm
D) 1.0 cm
A
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This large fuzzy blob in the center of this image is the central dominant galaxy of the cluster that surrounds it. The arrow points to several large clumps of stars near the center of the galaxy. What do those clumps probably represent?
A) Each clump was probably once the center of an individual galaxy. B) The clumps are regions of extremely strong x-ray emission. C) Each clump is the endpoint of one of the galaxy's spiral arms. D) The clumps are globular clusters orbiting the center of the galaxy.
Protostars start off more luminous than the main sequence stars they become
Indicate whether the statement is true or false
Huygens' principle applies mainly to
A) refraction of waves in a medium. B) reflection of waves. C) both of these D) neither of these
Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit. If you are measuring an object with length between 25 and 53 cm, how many significant figures will result if you only use the part of the meter stick between the 3-cm and 85-cm positions?
a. 1 b. 2 c. 3 d. 4 e. more than 4