The positron was first predicted by
A) Einstein.
B) Planck.
C) Elvis Presley.
D) Dirac.
E) Heisenberg.
D
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In order to calculate the size and luminosity of a galaxy, you must first determine its ____
a. age b. mass c. shape d. metallicity e. distance
If a wave's frequency doubles and its speed stays constant, its wavelength
A) becomes 16× longer. B) is also doubled. C) is unchanged, as c is constant. D) is now 4× longer. E) is halved.
At a given point above Earth's surface, the free-fall acceleration is equal to What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 770 km B) 970 km C) 1500 km D) 2000 km E) 2400 km
Distant snow-covered hills appear yellowish due to the color of the
A) atmosphere between the observer and the hills. B) selectively reflected light that reaches a distant observer. C) reflected light that survives scattering. D) sky that is reflected off the hills.