What are the wavelength and the corresponding photon energy (in electron-volts) of the primary light emitted by an ideal blackbody at each of the following temperatures? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1
60 × 10-19 J, and the constant in Wein's law is 0.00290 m ? K)
(a) 400°C?
(b) 800°C?
(c) 1200°C?
(a) 4.31 μm, 0.288 eV (b) 2.70 μm, 0.459 eV (c) 1.97 μm, 0.631 eV
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A 10.0-g bouncy ball is confined in a 8.3-cm-long box (an infinite well). If we model the ball as a point particle, what is the minimum kinetic energy of the ball? (h = 6.626 × 10-34 J ? s)
A) 8.0 × 10-64 J B) 3.2 × 10-46 J C) 1.3 × 10-20 J D) zero
A 0.025-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 150 N/m. The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest
The block then executes simple harmonic motion along the horizontal x-axis. When the displacement is x = 0.024 m, what is the kinetic energy of the block? A) 0.44 J B) 0.41 J C) 0.46 J D) 0.49 J E) 0.52 J
Give an example of a practical problem in which the variation of thermal conductivity with temperature is significant and for which a numerical solution is therefore the only viable solution method.
What will be an ideal response?
The uncertainty principle was formulated by
A. Einstein. B. Bohr. C. Heisenberg. D. Planck. E. Dirac.