Two speakers are connected to a signal source of 1000Hz and are set up 15 m apart. A person stands equidistant from each speaker so that each speaker individually produces the same intensity. When both speakers are on, the intensity is at a minimum. What could be the phase difference of the sound coming from the two speakers at this position?

0°

Explanation:

Since the speakers are equidistant from the person, there can only be constructive interference. . For constructive interference, the path difference ΔL = nλ a fractional number of wavelengths where λ = wavelength and n is a positive integer. For the intensity to be at a minimum, there must be destructive interference

λ = v/f where v = speed of sound in air = 343 m/s and f = frequency of signal = 1000 Hz

So, λ = v/f = 343 m/s ÷ 1000 Hz = 0.343 m

So for minimum intensity, n = 0

ΔL = nλ = (0)0.343 m = 0

So, the phase difference ΔФ = 2πΔL/λ  

= 2π(0 m)/0.343m

= 2π × 0

= 0°

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.