Question
Two identical loudspeakers are locates at point and , apart. The loudspeakers are driven by the same amplifier and produce sound waves with a frequency of . Take the speed of sound in air to be . A small microphone is moved out from point along a line perpendicular to the line connecting and ( line in fig )
At what distances from will there be destructive interference ?
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Practice questions from similar books
Question 1
Sound signal is sent through a composite tube as shown in the Figure 14.24. The radius of the semicircular portion of the tube is . The speed of sound in air is . The source of sound is capable of giving sound of varied frequency. If is an integer then frequency for maximum intensity is given by:Question 2
Answer the following questions:(a) In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band?
(b) In what way is diffraction from each slit related to the interference pattern in a double-slit experiment?
(c) When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?
(d) Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily.
(e) Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. What is the justification?
Question 3
Assertion : Short wave bands are used for transmission of ratio waves to a large distance Reason : Short waves are reflected by ionosphere [AIIMS 1994]Question 4
Let us list some of the factors, which could possibly influence the speed of wave propagation:
(i) nature of the source.
(ii) direction of propagation.
(iii) motion of the source and/or observer.
(iv) wavelength.
(v) intensity of the wave.
On which of these factors, if any, does
(i) nature of the source.
(ii) direction of propagation.
(iii) motion of the source and/or observer.
(iv) wavelength.
(v) intensity of the wave.
On which of these factors, if any, does
(b) The speed of light in a medium (say, glass or water), depend?
| Question Text | Two identical loudspeakers are locates at point and , apart. The loudspeakers are driven by the same amplifier and produce sound waves with a frequency of . Take the speed of sound in air to be . A small microphone is moved out from point along a line perpendicular to the line connecting and ( line in fig ) At what distances from will there be destructive interference ? |
