How deeply does each portion of the electromagnetic spectrum penetrate Earth's atmosphere? Why are space telescopes so important?
What will be an ideal response?
Answer:
(1) The only wavelengths that make it all the way to the surface are the narrow range of "visible" light (and a small amount of adjacent "infrared" wavelengths) and the "radio" wavelengths.
(2) Part of "infrared" wavelengths can be detected from high mountains or from aircraft.
(3) Most of other wavelengths, especially "X-ray" and "ultraviolet", can be observed only from very high altitudes or from space. As a result, without space-based observatories we could not study light from much of the electromagnetic spectrum.
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An object moves 15.0 m north and then 11.0 m south. Find both the distance it has traveled and the magnitude of its displacement
A) 4.0 m, 26.0 m B) 26.0 m, 4.0 m C) 26.0 m, 26.0 m D) 4.0 m, 4.0 m
A star on the main sequence has 7 solar masses. The star will evolve into a ____________ and its core will be supported by ______________.
a. white dwarf, electron degeneracy pressure b. neutron star, neutron degeneracy pressure c. black hole, no pressure (i.e., it will not be supported) d. white dwarf, neutron star, or black hole; electron degeneracy, neutron degeneracy, and no pressure, respectively.
A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60° with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil?
A. 55 mV B. 46 mV C. 50 mV D. 60 mV E. 35 mV
In order for a circuit to respond quickly, its time constant should be short. In a circuit involving resistance and capacitance, which of the following choices would result in the shortest time constant?
a. R = 75 ?, C = 75 ?F b. R = 200 ?, C = 200 ?F c. R = 300 ?, C = 75 ?F d. R = 100 ?, C = 30 ?F