20. An absorbing panel has to be placed in front of a sound reflecting wall what...
An absorbing panel has to be placed in front of a sound reflecting wall. At what distance from the wall should the panel be placed so that it would be most effective in absorbing sound whose frequency is 773 Hz? (Assume the speed of sound to be 343 m/s. Include units in your answer =? m.
Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear constructive interference? The speed of sound in air is 343 m/s. Multiple choice: 1.64 m 1.15 m 0.344 m 0.729 m
Two in-phase loudspeakers are placed along a wall and are separated by a distance of 6.00 m. They emit sound (take vs = 343 m/s) with a frequency of 137.2 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance x from the speaker the person can stand and hear a sound intensity maximum? 4. [5] Two in-phase loudspeakers are placed along a wall and are separated by a...
Please answer all and show work 13) (4p)Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s A) 1.2 m B) 0.73 m C)...
During the Apollo 11 moon landing, a retro-reflecting panel was placed on the surface of the moon. It is found that it takes 2. 51 seconds for light from the earth to reach the earth after reflecting on that panel. What is the speed of light if the earth moon distance is 3.84 times 108m?
Two identical loudspeakers are placed on a wall 3.00 m apart. A listener stands 5.00 m from the wall directly in front of one of the speakers. A single oscillator is driving the speakers at a frequency of 300 Hz. (a) What is the phase difference in radians between the waves from the speakers when they reach the observer? (Your answer should be between 0 and 21.) rad (b) What is the frequency closest to 300 Hz to which the...
Question 5 Two speakers are placed 5m apart, are both forward facing, and emitting sound in phase, with a frequency of 1000 Hz. A person is standing in front of the speakers, a distance of 20 m from the mid point between the speakers. If the person walks parallel to the speakers (sidewards), how far do they need to walk before they hear a maximum, after walking through a minimum? What angle does this make relative to the perpendicular of...
A politician is standing in front of a sound source playing a 440 Hertz tone. The politician, disturbed by a large hamster, starts moving to- wards the sound source. On average, a human can perceive a difference in frequency of about 0.5%. By how many Hz does the frequency have to shift (due to the Doppler effect) for the politician to notice? How fast, in meters/second, does one have to move to perceive a Doppler shift of 0.5%. Is this...
QUESTION 6 An object is placed 12 cm in front of a convex, spherical reflecting surface. The image of this object appears 7 cm behind the convex, spherical reflecting surface. Calculate the radius of curvature of the surface. o 33.6 cm 0 -8.84 cm 0 -33.6 cm o 8.84 cm QUESTION 7 You have a thin, double-convex lens made of glass and you want to use it to magnify an object without inverting it (you want magnification > 1). In...
Sound of frequency 2.0 kHz falls at normal incidence on a high wall in which there is a vertical gap that is 30 cm wide. A man is walking parallel to the wall, on the other side from the source of sound, at a perpendicular distance of 20 m from the wall. Assuming a speed of sound of 340 m/s, over what range of distance would he hear an intensity of sound: (a) more than 50% of the maximum? (b)...