Which of the following is not a factor that affects the apparent brightness of a star as seen from earth?
a. how old the star is
b. how big the star is
c. how hot the star is
d. how far away the star is

A. how old the star is

Explanation:

The brightness of a star can be determined by what we call an Apparent magnitude. Factors that affect the brightness of a star are:

a. How far away the star is

b. The size of the star or how big a star is

c. How hot the star is.

The brightness of a star or its Apparent magnitude as seen from the Earth can be measured or determined by using a scale from -26.8 to +29.

your answer is yx

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~mia

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: