Answer the following statement(s) true (T) or false (F)
1. The frequencies of the normal modes of a string that is free at both ends are the same as those of a string that is fixed at both ends
1. TRUE
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The Balmer lines correspond to wavelengths in the ________ part of the spectrum of a(n) ________ atom.
A. X-ray; helium B. ultraviolet; helium C. visible; hydrogen D. infrared; hydrogen
The laws of refraction and reflection are the same for sound as for light. The speed of sound in air is 340 m/s and in water it is 1510 m/s. If a sound wave approaches a plane water surface at an angle of incidence of 12.0°, what is the angle of refraction?
What will be an ideal response?
An electric current through a tungsten filament maintains its temperature at 2800 K
Assume the tungsten filament behaves as an ideal radiator at that temperature. Near what wavelength does the filament emit the greatest power? (? = 5.67 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.9 × 10-3 m ? K) A) 1200 nm B) 1600 nm C) 1800 nm D) 1000 nm E) 1400 nm
Which of these are metric units?
a. grams b. pounds c. seconds d. kilometers e. square miles