An electron has a kinetic energy of 10 eV. What is the wavelength of this electron?
A)
5.9 × 106 m
B)
1.2 × 10-10 m
C)
1.9 × 106 m
D)
3.9 × 10-10 m
E)
3.8 × 10-6 m
D
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Radial velocity is that component of an object's velocity that is directed perpendicular to an observer's line of sight
Indicate whether the statement is true or false
A thin-walled cylindrical tank, under internal pressure p, is compressed by a force F 5 75 kN. Cylinder diameter is d 5 90 and wall thickness t 5 5.5 mm. Allowable normal stress is 110 MPa and allowable shear stress is 60 MPa. The maximum allowable internal pressure pmax is approximately:
(A) 5 MPa
(B) 10 MPa
(C) 13 MPa
(D) 17 MPa
The number of cycles of a periodic process that occur per unit time is called
a. amplitude. b. frequency. c. period. d. wavelength. e. speed.
What do retro reflectors do?
a. Serve as a substitute for tail lights on cars. b. Cause light to pass through a mirror instead of reflecting it back. c. Cause light to reflect back in a straight line parallel to the direction it hits the mirror. d. Change the color at which light reflects back from a mirror by using filters. e. Cause the light to reflect at a right angle to the direction it hits the mirror.