Which of the following is not a method astronomers use to determine the physical conditions inside the Sun?
A) detecting solar neutrinos generated in the Sun's core
B) measuring Doppler shifts to observe solar vibrations
C) observing X-ray images of the solar interior using satellites
D) building mathematical models that use the laws of physics
E) both C and D
C
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If a sound level increases by 20 dB, the intensity increases by a factor of _______.
a. one thousand b. one hundred c. ten d. ten thousand
Optimize your images by achieving a balance between compressing your image files into a smaller size and maintaining the best image quality.
Answer the following statement true (T) or false (F)
If you want to store 2.0 mJ of energy in a 10-?F capacitor, how much potential do you need to put across it?
A) 5.0 V B) 10 V C) 15 V D) 20 V
Photographs of many young stars show long jets of material apparently being ejected from their poles
Indicate whether the statement is true or false