Question

In: Physics

7. Sirius has an approximate visual magnitude of -1.46 (Sirius A) a. How much brighter is...

7. Sirius has an approximate visual magnitude of -1.46 (Sirius A) a. How much brighter is Sirius than the star Achernar (Mv = 0.46) ? (looking for intensity, not magnitude) b. Sirius has a small white dwarf companion (Sirius B) with a magnitude of 8.5. How much brighter is the main star (Sirius A) than its companion (Sirius B)?

Expert Solution

Brightness of star is intensity of light received from it.

Intensity and apparent magnitude of two stars is given by relation

a)

Visual magnitude of Sirius is and Visual magnitude of star Achernar

Sirius is times brighter than Achernar.

b)

Visual magnitude of star Sirius B is

Main star Sirius A is times brighter than Sirius B.

-----------------

genius_generous answered 2 years ago

Star 2 has a magnitude of m2 = 10.0. Star2 is one hundred times brighter than...

Star 2 has a magnitude of m2 = 10.0. Star2 is one hundred times brighter than Star 1. What is the magnitude Star 1? Give your answer to the nearest integer.

A star with apparent visual magnitude mV = 3.5, absolute magnitude MB = 2.0 has parallax...

A star with apparent visual magnitude mV = 3.5, absolute magnitude MB = 2.0 has parallax of 0.03 arcseconds. Does this star look red or blue in the sky? Estimate its spectral type.

A sample of college students was asked how much they spent monthly on coffee. Approximate the...

A sample of college students was asked how much they spent monthly on coffee. Approximate the standard deviation for the cost. Monthly coffee cost ($) Number of students 10.00-19.99 6 20.00-29.99 20 30.00-39.99 . 23 40.00-49.99 18 50.00-59.99 . 6 The sample standard deviation for the cost is (Round to the nearest cent as needed.)

A sample of college students was asked how much they spent monthly on pizza. Approximate the...

A sample of college students was asked how much they spent monthly on pizza. Approximate the standard deviation for the cost. Monthly pizza cost. total number of students 10.99-19.99 7 20.99-29.99 20 30.99-39.99 23 40.99-49.99 20 50.99-59.99 5 The sample standard deviation for the cost is (round to nearest cent)

how much energy is needed to place four positive charges, each of magnitude +5.0 mc, at...

how much energy is needed to place four positive charges, each of magnitude +5.0 mc, at the vertices of a square of side 2.5 cm? choose one way of assembling the charges and calculate the potential at each empty vertex as this set of charges is assembled. be sure to clearly describe the order of assembly.

How much interest will be earned in the second year on an investment paying 7% interest,...

How much interest will be earned in the second year on an investment paying 7% interest, compounded annually, if $350 was just credited to the account for interest at the end of year 1? a. $374.50 b. $325.50 c. $350.00 d. $5,724.50

Assuming a discount rate of 7%, how much money should you be willing to pay for...

Assuming a discount rate of 7%, how much money should you be willing to pay for an investment that will generate annual cash ﬂows of $12,000 per year for ten years?

1. a) The star μ Cephei has an apparent magnitude of +4.73 in the V-band. How...

1. a) The star μ Cephei has an apparent magnitude of +4.73 in the V-band. How many times brighter is its apparent brightness in the V-band than in the B-band if its B-V color index is +2.35? b) Explain how μ Cephei’s apparent R-band magnitude of +1.98 demon- strates why this star is also known as the Crimson Star. c) Given that μ Cephei has a luminosity of 3.7 · 105L⊙, estimate this star’s absolute magnitude given its distance of...

If the p-value has to be between 1 and 0, how do we approximate the p-value?...

If the p-value has to be between 1 and 0, how do we approximate the p-value? For example, the p-value is 0.99999999777 when I use R, but if I put the same information into the Minitab, the p-value becomes 0. What is the rule for an approximation when it comes to the p-value? Is any p-value 0.9 and lower always going to be less than alpha=0.05?

Victor put $5,000 into a bank account 7 years ago. How much should have in the...

Victor put $5,000 into a bank account 7 years ago. How much should have in the account today if the account advertises a 5% APR compounded monthly? (Round to the nearest cent and do not enter the dollar sign)