This photo shows a single star photographed by the Hubble Space Telescope. Why doesn't the star appear as a single, sharp point of light?
A) The wave properties of light make this type of blurring an unavoidable feature of any telescope.
B) We are seeing a planetary system around the star.
C) The image of the star is overexposed.
D) The telescope was not properly focused when it took this photo.
A) The wave properties of light make this type of blurring an unavoidable feature of any telescope.
You might also like to view...
If the Moon is setting at noon, then it rose at
A) midnight. B) 9 A.M. C) 6 P.M. D) 6 A.M. E) noon.
The "hot shot" heat engine operating between 40°C and 380°C has an efficiency that is 60% of that of an ideal Carnot engine operating between the same temperatures
If the "hot shot" engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat? A) 36 kW B) 41 kW C) 57 kW D) 60 kW
How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 66.5 km/s B) 21.7 km/s C) 44.2 km/s D) 113 km/s E) 51.0 km/s
A horizontal disk with moment of inertia I1 rotates with angular speed ?1 about a vertical frictionless axle. A second horizontal disk, with moment of inertia I2 drops onto the first, initially not rotating but sharing the same axis as the first disk. Because their surfaces are rough, the two disks eventually reach the same angular speed ?. The ratio ?/?1 is equal to
1. I1 / I2 2. I2 / I1 3. I1 / (I1 + I2) 4. I2 / (I1 + I2)