Imagine that the sun began glowing half as bright at all visible wavelengths, but glowed much brighter in the infrared. How would this look to us, and why?
What will be an ideal response?
The sun would appear half as bright to our eyes, since our eyes are only sensitive to visible light. We could, however, detect the extra infrared light using our instruments.
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The ionosphere reflects high frequency radio waves
a. True b. False Indicate whether the statement is true or false
Molten iron is in a large foundry ladle at 1600ºC. Air at 150ºC is directly above the surface of the molten iron and the convective heat transfer coefficient is 300 W/m^2 ?K. Iron at atmospheric pressure has a saturation temperature of 1538ºC and a heat of fusion of 247.3 kJ/kg. If the convective heat transfer coefficient between the molten iron and the freezing iron is taken as 500 W/m^2, determine the time to form a 5-mmthick surface of solid iron in the ladle.
What will be an ideal response?
The Sun is supported against the crushing force of its own gravity by ________.
A. the force exerted by escaping neutrinos B. gas pressure C. its rapid rotation D. quantum forces E. magnetic forces
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.611 nm, what is the kinetic energy of the recoiling electron?
A) 1.5 × 10-18 J B) 2.1 × 10-18 J C) 3.1 × 10-18 J D) 4.3 × 10-18 J E) 5.2 × 10-18 J