How long a tuning fork vibrates when its handle is held against a table is most related to
A) its frequency.
B) resonance.
C) the conservation of energy.
D) the length of its prongs.
Answer: C
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Spiral arms are obvious—easily-seen features—because they contain ____
a. dense molecular clouds b. atomic hydrogen clouds c. sun-like stars d. OB associations e. supernovae
Two harmonic sound waves reach an observer simultaneously. The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity
What is the difference in frequency of the two sound waves? A) 10.0 Hz B) 0.200 Hz C) 5.00 Hz D) 2.50 Hz E) 1.25 Hz
A 41-turn square coil of area 0.074 m2 and a 123-turn circular coil are both placed perpendicular to the same changing magnetic field. The voltage induced in each of the coils is the same. What is the area of the circular coil?
a. 0.22 m2 b. 0.82 m2 c. 0.025 m2 d. 0.074 m2 e. 0.67 m2
The wavelength of the emitted photon when a hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 122 nm B) 203 nm C) 243 nm D) 389 nm E) 411 nm