A transformer for charging a power tool steps the line voltage down to 2.9 V. The output current of this transformer is 240 mA. If the transformer is ideal (100% efficient), what is the input current?
A)
9.9 A
B)
110 mA
C)
240 mA
D)
0.70 A
E)
5.8 mA
E
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For what type of object is the period-luminosity relation used for determining distances?
A) RR Lyrae variables B) T Tauri variables C) Cepheids D) Cataclysmic variables E) Planetary nebulae
A camera with a 20-cm diameter lens is recording images using a filter that allows only light of wavelength 600 nm to pass through
(a) What is the limit on the angular resolution (in microradians) in this case? (b) What is the diameter of the minimum-sized features that could be resolved on Mars with this camera? The distance to Mars at the time is 9.0 × 107 km.
Spectral Series: The Lyman series is formed by electron transitions in hydrogen that
A. end on the n = 1 shell. B. begin on the n = 1 shell. C. end on the n = 2 shell. D. begin on the n = 2 shell. E. are between the n = 1 and n = 3 shells.
Loop B?
A. Clockwise. B. Counterclockwise. C. No current flows in this loop. D. One needs more information to answer.