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Ccds A 105 Exam 2 Questions And Answers With Verified Solutions Latest Updated 2024
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Ccds A 105 Exam 2 Questions And Answers With Verified Solutions Latest Updated 2024
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Ccds A 105 Exam 2 Questions AndAnswers With Verified Solutions Latest
Updated 2024
Describe the properties and everyday uses of CCDs? - ANSWER✔✔CCDs contain
millions of pixels. They are much more sensitive than photographic plates and are
now used in mosaics, by astronomers, to cover a large field on the sky. Their
everyday uses are in digital cameras and cell phones.
How does the resolution of a telescope above the atmosphere depend on the size of
the mirror? - ANSWER✔✔The larger the mirror, the better the resolution, i.e the
sharper the images.
How much larger is the sun than the earth in diameter? In volume? -
ANSWER✔✔the sun diameter is 100x bigger than the earth,
Volume = 10^6 x the diameter of the earth
What is the average density of the Sun?How does this compare with water? -
ANSWER✔✔density = 1400 kg/m^3
water is 1000 kg/m^3
What is hydro static equilibrium for the Sun? - ANSWER✔✔Hydro static
equilibrium is a balance between the outward gas pressure force in the Sun and the
inward pull of gravity. The Sun supports its own weight by its outward gas
pressure force, so that it is neither contracting nor expanding
What is thermal equilibrium for the Sun? - ANSWER✔✔Thermal equilibrium is a
state in which the energy radiated by the photo sphere of the Sun is replaced by an
internal energy source, nuclear fusion in the core.
What are the central and surface temperatures of the Sun? - ANSWER✔✔Central
temp = 1.6 x 10^7 K
photo sphere is 5800k
What are the two most abundant elements in the Sun? - ANSWER✔✔Hydrogen
and helium also in the universe
, What is the physical state of the material in the Sun? - ANSWER✔✔ionized state,
electrons move freely rather than being bound to a particular nucleus
What type of particle is a normal hydrogen nucleus? - ANSWER✔✔proton
What is the energy source of the Sun? - ANSWER✔✔thermonuclear fusion of
hydrogen to helium in its core
Physical process of thermonuclear fusion how it releases energy? -
ANSWER✔✔Through a series of reactions. four hydrogen nuclei are fused to
produce one helium nucleus plus energy. the mass of normal helium nucleus is
slightly less than four times the mass of a normal hydrogen nucleus. The most
mass is converted to an equivalent amount of energy according to the relation E =
mc^2.
Discuss where this process occurs in the Sun and why its occurs there? -
ANSWER✔✔Nuclear fusion occurs only in the core of the Sun, since it is only
there that the temperature is sufficiently high (T>10^7 k). High temperature is
required for nuclear fusion, since nuclei must collide at high speed in order to
overcome their electrical repulsion.
About how long has the sun been in existence and about how much will the Sun's
present nuclear energy reserve last? - ANSWER✔✔5x10^9 years and 5x10^9
years
What mechanism transport energy in the Sun? Describe each process? Where does
each mechanism dominate? - ANSWER✔✔Energy is transported in the sun by
both radiation and convection. In radiation, photons random walk outward in the
Sun, carrying energy outward. In convection, hot gas rises and cool gas sinks, also
carrying energy outward. Radiation dominates in the core and the inner envelope
of the sun. Radiation dominates in the core and the inner envelope o the Sun.
Convection dominates in the outer envelope.
What is the evidence that convection occurs in the Sun? - ANSWER✔✔The
observation of granulation in the Sun's photo sphere provides direct evidence of
convection. The bright areas in the granulation pattern are the tops of rising
columns of hotter gas. The dark areas are sinking columns of cooler gas.
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