A diverging lens will be prescribed by the eye doctor to correct which of the following?
a. myopia
b. presbyopia
c. hyperopia
d. astigmatism
a
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You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16.0 cm. (a) If you were to use any two of these lenses to build a telescope, what is the maximum magnification you could achieve?
(b) If you were to use any two of these lenses to build a telescope, what is the lens separation for the maximum magnification telescope? What will be an ideal response?
X-rays always have more energy than radio waves
Indicate whether the statement is true or false
The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At the point closest to the Earth:
a. the angular speed will be greatest although the linear speed will be the same. b. the speed will be greatest although the angular speed will be the same. c. the kinetic energy and angular momentum will both be greater. d. None of the above.
The compound Ni3Al is used to strengthen nickel based alloys used in high temperature gas turbine materials. The crystal structure of Ni3Al is a cube with Al atoms at the eight cube corners and Ni at all of the cube face centers.
(a) What is the Bravais lattice type for Ni3Al and (b) What are the atom positions?