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Apparent magnitude: Quiz


Question 1: In Pogson's time this was thought to be true (see Weber-Fechner law), but it is now believed that the response is a ________ (see Stevens' power law).
Probability distributionZipf's lawPower lawPareto distribution

Question 2: Astronomers later discovered that Polaris is slightly variable, so they first switched to ________ as the standard reference star, and then switched to using tabulated zero points for the measured fluxes.
SiriusBeta LyraeVegaSun

Question 3: The ________ has located stars with magnitudes of 30 at visible wavelengths and the Keck telescopes have located similarly faint stars in the infrared.
James Webb Space TelescopeSolar and Heliospheric ObservatoryGreat Observatories programHubble Space Telescope

Question 4: [1] Pogson's scale was originally fixed by assigning ________ a magnitude of 2.
Beta Ursae MinorisPolarisGamma Ursae Minoris11 Ursae Minoris

Question 5: For objects within our Galaxy with a given ________, 5 is added to the apparent magnitude for every tenfold increase in the distance to the object.
Stellar classificationAbsolute magnitudeBinary starStar

Question 6: Since cooler stars, such as red giants and ________, emit little energy in the blue and UV regions of the spectrum their power is often under-represented by the UBV scale.
Planetary nebulaStellar classificationMain sequenceRed dwarf

Question 7: This somewhat crude method of indicating the brightness of stars was popularized by Ptolemy in his ________, and is generally believed to have originated with Hipparchus.

Question 8: Indeed, some L and T class stars have an estimated magnitude of well over 100, since they emit extremely little visible light, but are strongest in ________.
UltravioletElectromagnetic spectrumInfraredX-ray

Question 9: The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on ________, normalized to the value it would have in the absence of the atmosphere.

Question 10: This original system did not measure the magnitude of the ________.
StarSolar SystemEarthSun


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