To which group of polymers does polystyrene belong?
a. Natural
b. Hydrolytic
c. Addition
d. Condensation
c
You might also like to view...
In a grating experiment, light of 600 nm wavelength produces a first-order maximum 0.35 mm from the central maximum on a distant screen
On the same screen, a second monochromatic source produces a third-order maximum 0.87 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
As a stream flows downslope, if stream discharge doubles and the cross-sectional area of the channel also doubles, what happens to the average stream speed?
A) Average stream speed stays the same. B) Average stream speed decreases. C) Average stream speed increases. D) Not enough information is given.
Solar radiation at 600 W/m2 is absorbed by a black roof inclined at 30°C as shown. If the underside of the roof is well insulated, estimate the maximum roof temperature in Tinf= 20°C air.
GIVEN
• Inclined roof, well insulated on the underside
• Incline angle (?) = 30 degrees
• Air temperature = 20°C
• Solar radiation absorbed (qs) = 600 W/m2
FIND
• The maximum roof temperature
ASSUMPTIONS
• The roof behaves as a black body (? = 1.0)
• The sky behaves as a black body at 0 K
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4).
A light beam with wavelength 500 nm is reflected constructively from a thin layer of oil having index of refraction 1.25
The oil floats on the top of water of index of refraction 1.33. What is the minimum thickness of the layer of oil? A) 100 nm B) 150 nm C) 175 nm D) 200 nm E) 225 nm