Which of the following could not be determined by an observation that uses only spectroscopy?
A) the chemical composition of a distant star
B) the speed at which a distant galaxy is moving away from us
C) the surface temperature of a distant star
D) the rotation rate of a distant star
E) the size of a distant galaxy
E
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Vision Problems: A nearsighted man wears contact lenses of -3.00 diopters. With these lenses, his corrected near point is 25.0 cm. What is his uncorrected near point?
Fill in the blank(s) with the appropriate word(s).
Standing Sound Waves: A 2.0-g string that is 0.67 m long is under tension. The string vibrates at 700 Hz tone in its third harmonic, and this vibration causes a sound wave. What is the wavelength of the sound? The speed of sound in air is 344 m/s.
A. 0.49 B. 0.55 C. 0.61 D. 0.67 E. 0.45
In a given reversible process, the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume. Which one of the following statements about the gas is correct?
A) The gas must absorb heat from its surroundings. B) The gas must release heat to its surroundings. C) The pressure of the gas also stays constant. D) The process is adiabatic. E) It is impossible to predict on the basis of this data.
The study of compounds that contain carbon is called
a. biochemistry. b. inorganic chemistry. c. polymer chemistry. d. organic chemistry. e. physics.