Estimate the thermal conductivity of platinum at -10ºC if its electrical conductivity is 6 x 10^7 mhos/m, based on the Wiedemann-Franz law. Note: 1 mho = 1 amp/volt = 1 coulomb/volt-s, 1 W = 1 J/s = 1 volt-coulomb/s.
What will be an ideal response?
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Open spaces in ice crystals contribute to
A) decreased density. B) increased density. C) neither of these
An electron moves with a constant horizontal velocity of 3.0 × 106 m/s, and no initial vertical velocity as it enters a deflector inside a TV tube
The electron strikes the screen after traveling 17.0 cm. horizontally and 40.0 cm vertically upward with no horizontal acceleration. What is the constant vertical acceleration provided by the deflector? (The effects of gravity can be ignored.) A) 2.5 × 1014 m/s2 B) 8.3 × 102 m/s2 C) 1.4 × 104 m/s2 D) 1.2 × 1014 m/s2
What is the critical angle for light traveling from crown glass (n = 1.52 ) into water (n = 1.33 )?
A) 42° B) 48° C) 53° D) 57° E) 61°
Four resistors are connected in parallel: the resistance values are 4-ohms, 8-ohms,12-ohms, and 16-ohms: calculate the total circuit resistance