Galileo discovered ____ new planets called ‘Galilean moons.'
Fill in the blank(s) with correct word
4
four
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If a nucleus had a diameter of 8.0 × 10-15 m, what would its mass be in atomic mass units?
A) 7 B) 296 C) 37 D) 64 E) 128
A +4.0-?C charge is placed on the x axis at x = +3.0 m, and a ?2.0-?C charge is located on the y axis at y = ?1.0 m. Point A is on the y axis at y = +4.0 m. Determine the electric potential at point A (relative to zero at the origin)
a. 6.0 kV b. 8.4 kV c. 9.6 kV d. 4.8 kV e. 3.6 kV
A wave has peaks and troughs that can move matter up and down when the wave interacts with matter. The frequency of a wave is
A) the number of peaks passing by any point each second. B) the speed at which a wave moves through space. C) the distance between two adjacent peaks of a wave.
Astronomers have found the cosmic microwave background (CMB) radiation. What is the nature of this radiation?
A. It is a faint, uniform X-ray glow. B. It is a weak and very patchy glow at visible wavelengths. C. It is a faint, uniform radio signal. D. It is a bright, uniform X-ray glow. E. It is a weak background of cosmic neutrinos.