A small underwater pool light is 1.26 m below the surface of a swimming pool. What is the radius of the circle of light on the surface, from which light emerges from the water? (nwater = 1.333)
a. 0.77 m
c. 1.13 m
b. 0.57 m
d. 1.43 m
D
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Which of the following aluminum alloys is not suitable for welding?
(a) 1100 (b) 3003 (c) 5052 (d) 7075-T6
Describe the method of energy production in the Sun. What is the fuel? What is the end product? What kind of interactions occur? What is the role of temperature in the process? Could we use this process to produce energy on Earth?
What will be an ideal response?
The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?
A) 40 GHz B) 4.0 GHz C) 0.75 GHz D) 75 GHz E) 7.5 GHz
Suppose a 5.0-meter diameter telescope were constructed on the dark side of the moon. The viewing there (except for brief periods of sunlight) would be excellent. As an example, what would be the separation between two objects that could just be resolved on the planet Mars in 500 nm light? [The distance to Mars at closest approach is 50 million miles.]