The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron?
A) 2.04 × 103 m/s
B) 3.83 × 103 m/s
C) 1.92 × 103 m/s
D) 4.12 × 103 m/s
E) 5.22 × 103 m/s
C
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The electrical resistivity of tantalum (Ta) at temperatures approaching 0 K is 1×10-8 ?·m, and at 150K it is 7×10-8 ?·m. Analytically predict the electrical resistivity of Ta at 295 K.
What will be an ideal response?
Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show red shifts greater than 6. d. a and b e. a, b and c
Ganymede is the largest satellite in the solar system
Indicate whether the statement is true or false
The satellite that found the ripples in the cosmic background that led to galaxies is
A) COBE. B) the Hubble Space Telescope. C) SOHO. D) the Chandra X-Ray Observatory. E) the Compton Gamma Ray Observatory.