4-Fluoroheptane and 3-fluoroheptane are
a. isomers.
b. the same compound.
c. neither isomers nor the same compound.
b
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If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum, what is the speed of the electron?
(melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1,900 m/s B) 2,100 m/s C) 1,700m/s D) 1,500 m/s E) 540 m/s
The darker-colored bands in Jupiter's atmosphere are ________.
A. moving downward B. lower in altitude than the lighter-colored bands C. transparent, relative to the lighter-colored bands D. warmer than the lighter-colored bands E. All of these choices are correct.
In a double-slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 100 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point 5 mm from the central maximum when the wavelength is 400 nm? (Convert your result so the angle is between 0 and 360°.)
A. 90° B. 180° C. 270° D. 360° E. 160°
Estimate the cross-sectional area required for a 30-cm-long methanol-nickel heat pipe to transport 30 W at atmospheric pressure.
GIVEN ? Methanol-nickel heat pipe ? 30-cm-long ? Atmospheric pressure FIND (a) Cross-sectional area required to transport 30 W ASSUMPTIONS ? The type of wick to be used is a threaded artery wick ? 100°C operation