What produces the striking red, blue, and black colors of ionization nebulae?
What will be an ideal response?
The bright red color is produced by an emission line of hydrogen in which the electron falls from energy level 3 to energy level 2. Starlight reflected from dust grains produces the blue colors, because interstellar dust grains scatter blue light more effectively than red light. The black regions are dark, dense gas clouds that block our view of the stars beyond them.
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The resolving power of a microscope refers to the ability to
A) distinguish objects of different colors. B) form clear images of two points that are very close together. C) form a very large image. D) form a very bright image. E) form a very microscopic image.
The water level in a water tower is 50 m above the ground. What is the gauge pressure of the water at a faucet that is 20 m above the ground?
A. 1.8 atm B. 1.9 atm C. 2.1 atm D. 2.5 atm E. 2.9 atm
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by 10°C
a. True b. False Indicate whether the statement is true or false
What inductance must be put in series with a 200-? resistor at 4.00 kHz to have a total impedance of 240 ??
A) 12 mH B) 6.28 mH C) 3.28 mH D) 4.28 mH E) 5.28 mH