According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us doubles?

Q: Use a diagram to explain what is meant by the parallax angle, p, for a star observed twice from…

A: Diagram for explaining parallax angle:        o   star                                      / \…

Q: You measure a star to have a parallax angle of 0.12 arc-seconds. What fraction of a degree is this?…

A:

Q: In the parallax method of determining stellar distances, the angle to a star is measured while che…

A: Let's assume b=1AU And distance between sun and alpha centaurie is d. θ=2.1x10-4…

Q: How far away would the Sun need to be to be just visible to the naked eye (apparent magnitude =…

A: Solution: Given that apparent magnitude, m = 5.90 the absolute magnitude of the Sun, M = 4.83

Q: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0×10-12 watt/m?.…

A: Luminosity of star (L) = 7×1026 watt Apparent brightness (AB) = 4×10-12 Wm2

Q: A certain star is 13.7 times dimmer than a star with apparent magnitude m = 3.9.  What is the…

A: We are given the ratio of brightness of stars. We are given the apparent magnitude of the brighter…

Q: Star A has an apparent magnitude of –1.5 and is 12.6 light-years from Earth. Star B has an apparent…

A: Given: dA=12.6ly=3.863parsec, dB=15.6ly=4.783parsec, mvA=-1.5, mvB=0.4 The apparent magnitude of a…

Q: Which of the following is least reasonable regarding the magnitude scale: Group of answer choices…

A: The magnitude scale in astronomy helps us to quantify the brightness and distance of celestial…

Q: Earth is about 150 million kilometers from the Sun (1 Astronomical Unit, or AU), and the apparent…

A: The expression for the luminosity of the sun is given as, L=4πd2b

Q: The absolute magnitude of a star in the Andromeda galaxy (distance 690 kpc) is M = 5. It explodes as…

A:

Q: As we read in the book, a star that appears to be 1 magnitude brighter will have approximately 2.5…

A: Required : Approximate ratio of the flux.

Q: 8 What sentence explains why a star can be much farther from Earth than the Sun, but still be…

A: The sentence that explains this is : Distance from the Earth and apparent brightness are related.

Q: If we view a star now, and then view it again 6 months later, our position will have changed by the…

A:

Q: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the…

A: According to the guidelines, only one question will be answered. Please submit the other question…

Q: Which of the following is a true statement? A smaller diameter star can never have a smaller number…

A: The statement that is true among the options provided is:"A smaller diameter star can never have a…

Q: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0x10-12 watt/m?.…

A: Given: The luminosity is 7x1026 W. The apparent brightness is 4x10-12 W/m2.

Q: nitude m = 3.6.  What is the apparen

A: Given: To find the magnitude of the dimmer star is calculated shown as: m2 =3.6,b1b2  =12.4

Q: Consider two identical stars, A and B. Star B is 10 times farther away than star A. What is the…

A: