Both black and white road surfaces radiate energy. At midnight on a starry night the warmer road surface is the
A) black surface.
B) white surface.
C) neither, as no noticeable difference.
Answer: B
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The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons?
The number of electron carriers in 1.0 cm3 of copper is 8.5 × 1022 and e = 1.60 × 10-19 C. A) 0.044 mm/s B) 0.44 mm/s C) 0.44 cm/s D) 0.44 m/s E) 4.4 cm/s
You can tell whether a projectile is going upwards or downwards from the sign of __________
Fill in the blank(s) with correct word
The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)
a. 91.4 nm c. 456 nm b. 273 nm d. 122 nm
Which two methods can be combined to determine an extrasolar planet's density?
A) Doppler and astrometric observations B) Doppler and transit observations C) Doppler and gravitational lensing observations D) astrometric and gravitational lensing observations