The equivalent resistance is D) 
Explanation:
The equivalent resistance of n resistors in parallel is given by the equation:

For three resistors such as in this problem, the equation becomes

where we have the following:
is the resistance of the 1st resistor
is the resistance of the 2nd resistor
is the resistance of the 3rd resistor
Substituting, we find the equivalent resistance:


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Answer:

Explanation:
By using relation,
Speed of light = frequency × wavelength (in m)
Answer:
the Earth-Sun distance.
Explanation:
To measure parallax the base line distance that we need to know is the Earth-Sun distance. This distance is called 1 astronomical unit. This distance is 1.496×10^8 Km. So, this base line distance is necessary for the second link parallax.