What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1200 kHz radiowaves?
a. 11.4 m
b. 60 cm
c. 1.12 m
d. 62.5 m
e. 250 m
d
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The solubility parameter of polyethylene is 16.6 (MPa)0.5 and for ethanol it is 26.0 (MPa)0.5. Should ethanol dissolve polyethylene? _____________
Fill in the blank(s) with the appropriate word(s).
A spaceship, traveling at 0.560c towards a stationary space platform, launches a secondary towards the station with a speed of 0.100c relative to the spaceship
What is the speed of the secondary rocket relative to the space platform? A) 0.460c B) 0.575c C) 0.600c D) 0.625c E) 0.660c
A Young's double-slit apparatus is set up where a screen is positioned 0.80 m from the double slits. If the distance between alternating bright fringes is 0.83 cm, and the light source has a wavelength of 580 nm, what is the separation of the double slits? (1 nm = 10-9 m)
a. 6.0 × 10^-5 m c. 4.9 × 10^-5 m b. 2.8 × 10^-5 m d. 5.6 × 10^-5 m
Where did Thomson's model place electrons in the atom?
a. Studded throughout a positively-charged material. b. Rotating around a positively-charged core. c. Uniformly distributed in the atom. d. Clustered in the center of a positively-charged sphere. e. At the two magnetic poles of the atom.