Formal ways to say 'I'm sorry' to sound like a native speaker

Two stereo speakers are separated by a distance of 2.40 m. A person stands at a distance of 3.20 m directly in front of one of the speakers as shown in figure. Find the frequencies in the audible range (20-2000 Hz) for which the listener will hear a minimum sound intensity. Speed of sound in air = 320 ms^-1

Choose the correct form of tense for the given sentence: I'm sorry about this noise you hear. She .....for a concert.

two speakers A and B , placed 1 m apart, each produces sound waves of frequnecy 1800 Hz. In phase. A detector moving parallel to line of speakers distant 2.4 m away detects a maximum intensity at O nd then at P. speed of sound wave is

Two speakers separeted by some distance emit sound of the same frequency. At some point P the intensity due to each speaker separately is I_(o) . The path difference from P to one of the speakers is (1)/(2) lambda greater than that from P to the other speaker. What is the intensity at P if (a) the speakers are coherent and in phase, (b) the speakers are incoherent, and (c ) the speakers are coherent but have a phase different of 180^(@) ?

A small speaker has a capacity of power 3 W. A microphone is placed at distance 2 m from the speaker. Fine the displacement amplitude of particles of air near to microphone. The frequenct of sound emitted bt speaker is 1.0 KHz (Density of air = 1.2 kg//m^(3) and speed of sound in air = 330 m/s)

Three different vibrating objects produce three types of sounds X,Y and Z. sounds X and Y cannot be heard by a man having normal range of hearing but sound Z. can be heared easily. The sound X is used in hosphitals to break kidneys stones of a patient into fine grains which then get flushed out with urine. The sound Y is similar to that which is produced during an earthquake before the main shock wave is generated. (a) What type of sounds are (i) X (ii) Y, and (iii) Z? (b) Name one device which can produce sound like X. (c) Name one device in a science laboratory which can produce sound like Y. (d) Name one device in our homes which can produce sound like Z. (e) What is the frequency range of sounds like Z?