A soft magnetic material has which property?
a. It cannot be magnetized.
b. It is easy to magnetize.
c. It is hard to magnetize.
d. It attracts slowly moving charges.
b
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An achromatic lens brings all colors to the same focus
a. True b. False Indicate whether the statement is true or false
What is different between a particle and its antiparticle?
a. opposite electric charge b. opposite strangeness c. opposite charm d. all of the above
A laser beam sends a uniform radiation beam towards the hemispherical opening in a solid housing with dimensions as shown. The surface of the cavity is black and essentially insulated from the surrounding housing material. The hemispherical cavity is a thin-walled metal with a black surface. The temperature of the housing as well as that of the surroundings is 25°C. Determine the radiant flux of the laser beam, G0 [W/m2], if a thermocouple located on the hemispherical surface indicates a temperature of 10°C.
GIVEN
• Laser beam sending uniform radiation beam towards the hemispherical opening.
• Temperature of housing and surrounding (T?)= 250C.
• Temperature difference on thermocouple in hemispherical surface (?Tc) = 100C.
FIND
• Radiant flux of the laser beam.
ASSUMPTIONS
• Cavity surface is black and perfectly insulated from its mounting material.
• Negligible convection heat transfer from cavity surface.
• Surroundings are large, isothermal.
Shallow-sloped shield volcanoes are made from lava that
A) is as runny as liquid water. B) has a medium viscosity. C) has a high viscosity. D) can have any viscosity.