An organ pipe open at both ends has a length of 0.800 m. If the velocity of sound in air is what are the frequencies of the second and third harmonics?
What will be an ideal response?
425. Hz; 638. Hz
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The brightest stars in aging globular clusters will be
A) blue supergiants like Rigel and Deneb. B) massive blue main-sequence stars like Spica. C) blue stragglers. D) red supergiants like Betelgeuse and Antares. E) core stars of planetary nebulae.
A(n) ______________ is equivalent to 3.26 light-years
Fill in the blank(s) with correct word
A 15-kg block rests on a level, frictionless surface and is attached by a light string to a 10-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2, what is the tension in the connecting string?
a. 65 N c. 59 N b. 17 N d. 37 N
An atom containing three outer-shell electrons is added to a Group IV semiconductor such as silicon. The result is
1.a p-type semiconductor. 2.an insulator. 3.an n-type semiconductor. 4.a conductor.