The grand unified theory (GUT) is a sought-after model that would unify three of the four forces of nature. Which force is the one it would not include?
A) gravitational
B) strong
C) weak
D) electromagnetic
A
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If the sun's surface cooled, how would its appearance change?
A) It would appear more blue. B) It would stay the same. C) It would become bright white. D) It would appear more red.
At the surface of Saturn's atmosphere the strength of the magnetic field is
A) about the same as Mercury's magnetic field at its surface. B) about the same as Venus' magnetic field at its surface. C) about the same as Earth's magnetic field at its surface. D) about the same as Mars' magnetic field at its surface. E) about the same as Jupiter's magnetic field at its atmospheric surface.
The formula can be used to calculate a star's _____
a. mass b. distance c. rotation speed d. revolution period e. diameter
A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the lowest frequency associated with this portion of the spectrum?
A) 1.50 × 1014 Hz B) 7.50 × 1013 Hz C) 7.50 × 1014 Hz D) 7.50 × 1015 Hz E) 1.50 × 1015 Hz