If you triple your distance from an object, what happens to its angular size?
A. It decreases by one half.
B. It reduces to one third of what it was.
C. It stays the same.
D. It increases by a factor of nine.
Answer: B
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In terms of the global warming that has been occurring on Earth over the past few decades, what is the key message from this figure?
A) Changes in the Sun's energy output (irradiance) cannot explain the observed warming. B) The Sun's energy output (irradiance) tracks quite well with the observed warming trend. C) The Sun's energy output (irradiance) and Earth's global average temperature both vary in an 11-year cycle. D) Scientists have no way to explain the observed global warming trend.
A series of fission reactions in which subsequent reactions are initiated by the neutrons produced in the previous reactions is called a
A) critical reaction. B) chain reaction. C) usion reaction. D) neutron catastrophe. E) chemical reaction.
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the earth. Yet we detect large numbers of muons at ground level because of the Pauli exclusion principle
Indicate whether the statement is true or false
The heart of the spectroscope
A. Prism or A Diffraction Grating |
B. Annie Jump Cannon |
C. Temperature |
D. Spectroheliometer |
E. Continuous Spectrum |
F. Joseph Van Fraunhofer |