A 60.0 cm long organ pipe is filled with air and is open at both ends. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fundamental mode?
A. 115 cm
B. 120 cm
C. 131 cm
D. 142 cm
E. 167 cm
B. 120 cm
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The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
Eleven molecules have speeds 16, 17, 18, . . . , 26 m/s. Calculate the root-mean-square of this group of molecules
A) 21.2 m/s B) 21.0 m/s C) 21.5 m/s D) 21.7 m/s
Uncertainty Principle Using Energy and Time: The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)(a) What is the average lifetime of this state, in femtoseconds?(b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?
What will be an ideal response?
A slit of width 2.0 ?m is used in a single slit experiment with light of wavelength 650 nm. If the intensity at the central maximum is I0, what is the intensity 10° from the center?
A) 0.50I0 B) 0.35I0 C) 0.030I0 D) 0.53I0 E) 0.43I0