____ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space
a. Infrared radiation
b. Ultraviolet radiation
c. Radio wave radiation
d. X-ray radiation
e. Visible light
B
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The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end
The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together? A) 76°C B) 133°C C) 148°C D) 155°C
Which of the following is a vector quantity?
A) area B) volume C) mass D) none of the above
What class of material is the least expensive per unit volume that for certain has an elastic modulus of over 100 GPa?
(a) GFRP (b) Concrete (c) Cast iron (d) Steel
Snell's Law: A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?
A. 20.9° B. 47.5° C. 51.8° D. 30.0° E. 14.9°