An ideal monatomic gas undergoes an isothermal expansion. It is correct to affirm that its entropy
A) decreases.
B) remains unchanged.
C) increases.
D) cannot be predicted with the data given.
C
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What is the momentum of a photon of light that has a wavelength of 480 nm?
A) 1.1 × 10-27 kg?m/s B) 2.2 × 10-27 kg?m/s C) 1.8 × 10-27 kg?m/s D) 1.4 × 10-27 kg?m/s E) 2.0 × 10-27 kg?m/s
What is the significance of this photograph?
A) It shows the first person ever to land on Mars. B) It shows a person standing on the most distant world ever visited by a human being. C) It shows the first person ever to go into space. D) It was taken Jan. 1, 2000, to commemorate the turn of the millennium.
A sample contains 
The half-life of 
years. What is the activity of the sample?
A. 3300 Bq B. 1250 Bq C. 382.0 Bq D. 265.0 Bq E. 3.000 Bq
Most SETI searches are done at
A) X-ray wavelengths. B) visual wavelengths. C) infrared wavelengths. D) radio wavelengths. E) gamma wavelengths.