The two forms of electromagnetic (E-M) radiation that experience the least atmospheric opacity are
A) visible light and infrared waves.
B) X and gamma radiation.
C) microwaves and radio waves.
D) ultraviolet and infrared waves.
E) visible light and radio waves.
E
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What is the common trait of all main-sequence stars?
A) They generate energy through hydrogen fusion in their core. B) They are in the final stage of their lives. C) They are all spectral type G. D) They all have approximately the same mass.
One time constant after an RL circuit has its switch closed, how does the current I in it compare to the maximum current Imax that occurs for this circuit?
a. I > Imax/2 b. I = Imax/2 c. I < Imax/2 d. Without knowing R and L, this cannot be determined.
A proton is accelerated from rest through 500 V. It enters a magnetic field of 0.30 T oriented perpendicular to its direction of motion. Determine the radius of the path it follows
A) 1.1 mm B) 1.1 cm C) 11 cm D) 1.1 m E) 11 m
A major source of chlorine gas, ci2, is from the electrolysis of brine, which is concentrated salt water, NaCI(aq). What is the sign of the electrode where the chlorine gas is formed? Is it negative or positive?
A) Positive, since the chloride ions lose electrons to form chlorine molecules. B) Negative, since the chlorine gas needs to deposit electrons to form chloride ions. C) Neither, since chlorine gas is a neutral molecule, there is not electrode attraction. D) Both, since the chloride ions from NaCl (aq) are attracted to the positive electrode to form chlorine molecules while the produced chlorine gas molecules move to deposit electrons at the negative electrode.