Which step in the development of the atomic bomb was made by Enrico Fermi and his team in 1942?
a. The first observation of splitting of the nucleus.
b. The first calculation of the energy released when a nucleus was split.
c. The discovery that E = mc2 applies to the processes that occur when neutrons are captured by uranium nuclei.
d. The first artificial sustained chain reaction.
e. The first successful atomic bomb test.
d
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The two days when the Sun rises due east and sets due west are the ________
Fill in the blank(s) with correct word
In the Lighthouse model:
A) pulsars are observable only if they lie in the galactic plane. B) pulsars are navigational devices created by interstellar navigators as discovered by Jocelyn Bell in 1967. C) all pulsars have their poles pointed directly at us or they would be not observable. D) if the beams sweeps across us, we can observe the pulse. E) the period of pulsation must speed up as the neutron star continues contracting.
Temperature inversions involve a higher temperature at ground level than in the air over the ground
What will be an ideal response?
The correct value for the speed of light in air is
A. 1.86 × 105 feet/s. B. 3 × 105 km/h. C. 1.86 × 105 miles/h. D. 3 × 108 m/s. E. 3.0 × 105 m/s.