Hubble's law requires calibration with distances measured by standard candle techniques. Which standard candle technique is best for measuring the distances of very distant galaxies?

What will be an ideal response?

White dwarf supernovae (distant standards)

Physics & Space Science

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The dark age is a period lasting hundreds of millions of years until the formation of the first stars

Indicate whether the statement is true or false

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What is the composition of minerals?

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Potential of Point-Charges: Two +6.0-µC charges are placed at two of the vertices of an equilateral triangle having sides 2.0 m long. What is the electric potential at the third vertex, relative to infinity, due to these charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)

A. 54 kV B. 108 V C. 0 V D. 90 kV E. 27 kV

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Physics & Space Science

Which of the following statements cannot be associated with the electroweak interaction?

a. The electroweak theory was proposed by Sheldon Glashow, Steven Weinberg, and Abdus Salam. b. The W and Z particles are responsible for the weak interaction. c. The W and Z particle masses are greater than 100 GeV/c2. d. C. Rubbia and his team discovered massive bosons at CERN.

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Physics & Space Science