A galvanometer can be calibrated to measure
A) electric current.
B) electric voltage.
C) both of these
D) none of these
Answer: C
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A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
a. 2.0 × 10^4 J. b. 2.5 × 10^4 J. c. 1.7 × 10^3 J. d. 1.5 × 10^3 J. e. 4.0 × 10^4 J.
Improvements in technology will eventually allow the entire electromagnetic spectrum to be observed from high mountaintop observatories
Indicate whether the statement is true or false
Oxygen has atomic number 8. How many times must an oxygen atom be ionized to create an O+5 ion, and how many electrons will the ion have?
A) It must be ionized three times; it now has five electrons. B) It must be ionized five times; it now has five electrons. C) It must be ionized five times; it now has three electrons. D) It doesn't have to be ionized; it just needs to gain five protons. E) It doesn't have to be ionized; it already has only three electrons.
Why do Cepheids pulsate?
What will be an ideal response?