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

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science