3 and 4 A * TEA 57% 1 6:49 PM3. Someone is speeding on the road at 89 mph (39.8. m/sec). A police car is coming from oppositedirection at 95 mph (42.5 m/s) with a siren frequency of 1200 Hz. Find the frequency heard by thedriver. Take the speed of sound at 20C as 343 m/sec.а. 1189 Hzb. 1528 Hzс. 1192 Hzd. 1211 Hz4. The linear density of a violin string is 7.8 x 10* kg/m. A wave on the string has a frequency of 440Hz and a wavelength of 65 cm. Find the tension on the string.a. 0.22 Nb. 63.8 Nc. 0.036 Nd. 6.38 x 10° N5. A pipe with one end open and one end closed produces a fifth harmonic frequency of 1760 Hz at 20degree C. Find the length of the pipe.а. 14.7 стb. 29.3 стc. 48.7 cmd. 24.4 cm6. An infinitely long wire has a charge density of 2.7 x 10° C/m. Find the electric field 5.00 m awayfrom the wire.a. 0.97 N/Cb. 9.71 N/Cc. 4.86 N/Cd. 1.94 N/C

“Since you have asked multiple questions, we will solve the first question (Question number 3) for you. If you want any specific question to be solved then please specify the question number or post only that question.” 3. The speed of the person (observer) is v0 = 89 mph = 39.8 m/s. The speed of the police car (source) is vs = 95 mph = 42.5 m/s. Assume the frequency of the siren heard by the observer is denoted by fobs. The frequency of the siren at the source is f = 1200 Hz. Assume the speed of sound in air as v = 343 m/s.Find the frequency of the siren heard by the person (observer) as follows: Hence, the frequency of the siren heard by the driver is option b. 1528 Hz.