Who headed the project to construct the world's first human-made nuclear reactor?
A) Edward Teller
B) Leo Szilard
C) Albert Einstein
D) Enrico Fermi
E) J. Robert Oppenheimer
D
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Hubble's tuning fork diagram represents the evolution path of galaxies from elliptical to spiral.
Answer the following statement true (T) or false (F)
Which of the following colors is scattered most readily by small particles in the air?
a. green c. yellow b. blue d. red
An object requires a force of 30 N to hold it under water. The object weighs 90 N in air. Its density is nearest:
Spectrographic analysis of light from a distant galaxy shows that the galaxy is receding from Earth at v = 0.384 c. Use Hubble's law with H = 17 km/s/106 lightyears to estimate the distance to the galaxy
a. 3.3 × 10^8 lightyears b. 6.8 × 10^9 lightyears c. 9.9 × 10^8 lightyears d. 2.2 × 10^9 lightyears e. 6.5 × 10^6 lightyears