Approximately what is the half-life of uranium-235?
a. 0.5 billion years
b. 1.25 billion years
c. 700 million years
d. 2.8 billion years
Answer: 700 million years
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Sorted spectral data and designed the stellar spectral types
A. Prism or A Diffraction Grating |
B. Annie Jump Cannon |
C. Temperature |
D. Spectroheliometer |
E. Continuous Spectrum |
F. Joseph Van Fraunhofer |
If a binary is detected by periodic shifts in its spectral lines, it is a(n) ________ binary
Fill in the blank(s) with correct word
Rank the following media in order according to the speed of light in them, from slowest to fastest: vacuum, air, water and glass
a. air, water, glass, vacuum b. glass, air, water, vacuum c. water, glass, air, vacuum d. glass, water, air, vacuum e. none of the above
An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.