What is the intensity of a 70. dB sound?
What will be an ideal response?
10-5 W/m2
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Light from Proxima Centauri takes 4.2 years to reach Earth
Indicate whether the statement is true or false
Supernovae are ____
a. very common: there are thousands of detectable events occurring in our galaxy each year b. common: a few dozen are detected in our galaxy each year c. uncommon: there are only one or two detected in our galaxy each year d. rare: only one or two occur each century in our galaxy e. extremely rare: only one or two are detected in the Universe each decade
Three resistors of 12 ?, 12 ?, and 6.0 ? are connected together, and an ideal 12-V battery is connected across the combination. What is the current through the battery if they are connected (a) in series or (b) in parallel?
What will be an ideal response?
Before turning into a white dwarf, a star like the Sun will spend most of its life as a main sequence star.
Answer the following statement true (T) or false (F)