Question

# Which of the following is closest to the distance from Earth to a star having an...

Which of the following is closest to the distance from Earth to a star having an Absolute Magnitude of -1 and an apparent Magnitude of 2.5 ? Question 18 options: 150 parsecs 100 parsecs 50 parsecs 25 parsecs

Question 13 (1 point) Saved Which of the following is closest to the Absolute Magnitude of a star having a luminosity of 150 times the luminosity of the Sun ? Question 13 options: 0.0 -1.0 1.0 -2.0

Question 14 (1 point) Saved Which of the following is closest to the surface temperature of a two solar radius star having an Absolute magnitude of -2 ? Question 14 options: 7000 K 12000 K 22000 K 60000 K

Question 15 (1 point) Saved Which of the following is closest to the spectral class of a star having an effective surface temperature of 4900 K Question 15 options: K1 M5 B2 B8 M8

Question 16 (1 point) Saved Visible light has wavelengths ranging between approximately 4000 and 7000 Angstroms ( 400 to 700 nanometres ) . Which of the following statements is true regarding the surface temperature of a star for which the wavelength of maximum intensity falls in the visible range ? Question 16 options: It could never be cooler than 8000 K It must always be cooler than 5500 K It must lie between 8000 K and 5500 K It must always be hotter than 3500 K Question 17 (1 point) Saved Star A has a smaller radius and a higher surface temperature than star B . how do the luminosties of the two stars compare ? Question 17 options: Star A is more luminous than star B Star A is less luminous than Star B The luminosities of the two stars will be equal Not enough information is given to determine which of the above answers is correct

#### Homework Answers

Answer #2

Concept required-

Absolute magnitude -It is the magnitude of a star if it was located at a distance of 10parsec from earth. It is related to the apparent magnitude by the formula-

Where M is the absolute magnitude, m is the apparent magnitude, d is the distance in parsec

Solution -

We are given the following data from the question -

m=2.5 ; M=-1, d=?

So putting these values in our question , we get -

Thus 25 parsec is the closest distance to the said star

answered by: anonymous
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