What did COBE find regarding the smoothness of the cosmic background radiation?
What will be an ideal response?
COBE found that the cosmic background radiation has a perfect thermal radiation spectrum, with a peak corresponding to a temperature of 2.73 K. However, it also found slight fluctuations in the radiation. The temperature varies very slightly from one place to another by a few parts in 100,000.
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The sidereal drive on a telescope mounting must turn the telescope eastward about the polar axis
a. True b. False Indicate whether the statement is true or false
The ______________ of a given solute is the amount of solute that will dissolve in a specified mass of solvent at a given temperature to produce a saturated solution
Fill in the blank(s) with correct word
When 1.0 kg of steam at 100°C condenses to water at 100°C, what is the change in entropy of the steam? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) zero B) 6.1 × 103 J/K C) -6.1 × 103 J/K D) 22.6 × 105 J/K E) -22.6 × 105 J/K
Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 10^7 m/s?
a. 5.8 kV b. 2.6 kV c. 7.1 kV d. 8.6 kV e. 5.1 kV