In order to produce a hologram, one needs, in addition to an object and a piece of photographic film,

A) a beam of monochromatic light and a mirror.
B) a beam of coherent light and a lens.
C) a beam of monochromatic light and a lens.
D) a beam of coherent light and a mirror.


D

Physics & Space Science

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The 99 years that revolutionized Astronomy ended with whose death?

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What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's center?

G = 6.67 × 10?11 m3?kg?1?s?2; MEarth = 5.98 × 1024 kg

a.
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b.
20 m/s

c.
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d.
2000 m/s

e.
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241Am decays by alpha particle emission. The daughter isotope in this case is (the atomic numbers of Np, Pu, Am, Cm, and Bk are 91, 92, 93, 94, and 95 respectively)

A) 239Np. B) 237Np. C) 245Bk. D) 235Bk. E) not given.

Physics & Space Science