The Doppler effect is sensitive only to motion along the line of sight
Indicate whether the statement is true or false
T
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Semiconductors: The energy gap between the valence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 599 nm B. 959 nm C. 873 nm D. 994 nm
A microphone records sound produced from two speakers in a room with no other sound sources. If the intensity of one of the sound waves at a given location is 0.055 W/m2 and if the microphone receives a minimum intensity of 0.004 
when both speakers are active what is a possible value for the intensity of the other source at the microphone’s location?
A. Need more info to solve.
B. 0.088 
C. 0.051
D. 0.048
Based on the H-R diagram shown above, what is the approximate luminosity of a main-sequence M star?
A) 10?6 times that of the Sun B) 0.01 times that of the Sun C) 1 times that of the Sun D) 10 times that of the Sun
A parallel-plate capacitor has plates of area 0.20 m2 separated by a distance of 1.0 mm. What is this capacitor's capacitance?
A) 2.0 × 102 F B) 40. F C) 1.8 nF D) 0.35 nF E) 22. ?F