Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at a frequency of 3.6 MHz. All radio measurements are made far from the antennas
The smallest angle, reckoned east of north from the antennas, at which constructive interference of two radio waves occurs, is closest to: A) 50°
B) 55°
C) 45°
D) 40°
E) 35°
A
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One measure of the ductile-to-brittle transition temperature is the temperature where _________percent of the fracture is brittle.
Fill in the blank(s) with the appropriate word(s).
The sun is
a. a star which generates its own energy b. 1 AU from Earth. c. visible by its own light emission. d. all of the above
Photographs of many young stars show long jets of material apparently being ejected from their poles
Indicate whether the statement is true or false
A two-slit apparatus is covered with a red (660 nm) filter. When white light is shone on the filter, on the screen beyond the two-slit apparatus, there are 9 interference minima within the 4.5 cm-wide central diffraction maximum. When a blue (440 nm) filter replaces the red, how many fringes will there be in the central diffraction maximum?
A. 3 B. 13 C. 9 D. 6