Please check my answers!
1. A person moves away from a stationary sound source. Which phrase describes the sound perceived by the person?(1 point)
A. higher pitch and shorter wavelength
B. higher pitch and longer wavelength
C. lower pitch and shorter wavelength
D. lower pith and longer wavelength<--
3.A stationary source produces a sound wave at a frequency of 100 Hz. The wave travels at 1125 feet per second. A car is moving toward the sound source at a speed of 100 feet per second. What is the wavelength of the stationary sound source and the wavelength that a person in the car perceives?
A. wavelength of the stationary source: 11.25 ft; perceived wavelength: 10.25 ft<--
B. wavelength of the stationary source: 12.25 ft; perceived wavelength: 11.25 ft
C. wavelength of the stationary source: 11.25 ft; perceived wavelength: 12.25 ft
D. wavelength of the stationary source: 10.25 ft; perceived wavelength: 11.25 ft
4. When a guitar string is plucked, what part of the standing wave is found at the fixed ends of the string?
A. the harmonics
B. the resonance
C. the nodes<--
D. the antinodes
5. A person is singing in the shower. They notice that as certain notes become very loud, the shower walls vibrate. Which statement describes this effect?
A. the note is one of the antinodes for the shower.
B. the note is one of the nodes for the shower.<--
C. the note is one of the natural amplitudes for the shower.
D. the note is one of the harmonic resonance for the shower.
Plz respond as soon as possible🙏
1. lower pitch and longer wavelength
2. The low-pitched sound corresponds to the sound of the source moving away; its wavelength is longer. The high-pitched sound corresponds to the sound source moving closer; the wavelength is shorter.
3. wavelength of the stationary source: 11.25 ft; perceived wavelength: 10.25 ft
4. the nodes
5. The note is one of the harmonic resonance for the shower.