an ambulance is moving towards a stationary listener at a constant speed of 30 m per second. The siren of the ambulance emits sounds waves having a wavelength of 0.28 m .Take the speed of the sound in air as 340 m per second .Calculate the frequency of the sound waves emitted by the siren as heard by the ambulance driver​

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Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Draw the structure for 5-isopropyl-2-methyl-3-nonene