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
You might also like to view...
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?
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
The uncertainty principle was formulated by
A. Einstein. B. Bohr. C. Heisenberg. D. Planck. E. Dirac.