Which of the following frequencies could NOT be present as a standing wave in a 2m long organ pipe open at both ends? The fundamental frequency is 85 Hz
a. 85 Hz.
b. 170 Hz.
c. 255 Hz.
d. 340 Hz.
e. 382 Hz.
e
Physics & Space Science
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Write the node equations for describing heat transfer through the buried waste shown in Figure 2-67.
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Red dwarfs (have/have not) yet died or evolved off the main sequence
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According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle of
a. 60 degrees. b. 30 degrees. c. less than 30 degrees. d. none of the above.
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Radio waves are reflected by which of the following ion layers?
a. C b. D c. E d. B
Physics & Space Science