APFIVE Beat Frequency and Temperature Effects
A student observes that the beat frequency between two sound sources increases from 2 Hz to 6 Hz when one source is heated. If the initial frequencies were 422 Hz and 424 Hz, what physical principle explains this change, and what is the new frequency of the heated source?
A
Wave diffraction; 426 Hz
B
Doppler effect; 430 Hz
C
Thermal expansion; 428 Hz
D
Thermal expansion; 416 Hz
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