1. The ability to separate object or details into distinct features is ____. A)
ID: 112884 • Letter: 1
Question
1. The ability to separate object or details into distinct features is ____.
A) Magnification
B) Spectroscopy
C) Light gathering power
D) Resolving power
2. Radio telescopes have very large apertures when compared to optical instruments. Such apertures are needed to maintain
A) Costs of the observatory
B) Resolving power at longer wavelengths
C) Magnification
D) Temperature Sensitivity
3. Space telescopes of various wavelength capabilities are put into orbit to do all of the following except ____.
A) Avoid light pollution
B) Avoid the blurring effects of the atmosphere
C) Measure wavelengths, which do not penetrate the Earth’s atmosphere
D) Get closer to their objects of study.
4. Atoms emit light at the moment when ____.
A) Electrons jump down to a lower energy level
B) Electrons jump to a higher energy level
C) Light is absorbed from an external source
D) They spin
5. A star's spectrum of hydrogen is observed from the Earth with wavelengths all shifted to longer wavelengths. The star is ______.
A) Increasing its temperature
B) Decreasing its temperature
C) Moving toward the Earth
D) Moving away from Earth
6. When observing an animal in a dark forest, the animal could easily be seen with a camera utilizing ______.
A) Blue light
B) Infrared light
C) UV Rays
D)Spectroscopy
7. A larger mirror on a reflecting telescope will ____
A) Shifts its useful collection wavelength
B) Decrease its light gathering power
C) Increase its light gather power
D) Reduce its resolving power
8. All of the following wave properties distinguish the parts of the electromagnetic spectrum from each other except ___
A) Wavelength
B) Speed
C) Energy
D) Frequency
9. As an object increases its temperature, the peak wavelength or color it appears would change according to which list (progressing from left to right) below?
A) Violet, blue, red
B) UV, IR, Radio
C) Infrared, red, orange, yellow
D) Blue, red, orange, violet
10. The wavelength range on this list that gets its entire range through Earth's atmosphere is____
A) X-Ray
B) UV
C) Radio
D) Gamma Ray
Explanation / Answer
1. C) Light gathering power
The ability of a telescope to collect a lot more light than the human eye, its light-gathering power, is probably its most important feature. The telescope acts as a "light bucket'', collecting all of the photons that come down on it from a far away object. Just as a bigger bucket catches more rain water, a bigger objective collects more light in a given time interval. This makes faint images brighter. This is why the pupils of your eyes enlarge at night so that more light reaches the retinas.
Very far away, faint objects can be seen only with BIG objective telescopes. Making faint images brighter is critical if the light is going to be dispersed to make a spectrum.
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