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

Physics & Space Science

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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).

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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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science