Well from the given beat frequency, we can find out the frequency reflected big toe. An observed by, uh, the re dollar. Then we have don't have Delta is equal to, uh, if not minus. Ah, Sorry. Its source frequency address and f is minus f Not here. Delta is the beat frequency actresses the frequency of the Radio Micro where emitted by the radar and if not, is the finally frequency observed by the radar. And let's find out if not, well, delta after he's, uh, 3000 to mine 100 on, then we have f s, which is 33 point fuller. Multiply by 10 to the power nine minus f not right. And therefore, if not, if not, it's equal to, um three point. Ah, Treaty three on here. 9999 uh, 61 Multiply by 10 to the power than hers. Uh, 10 hearts. All right? No, we have are a 33.4 a month apply by 10 to the power nine minus, if not, is equal to minus 3900 And in this case, we get, if not, is equal to 3.34 Our tree buying train foreign 0000 39 Multiply by 10 to the power 10 hers damn horse. And this mentally depends whether the car was approaching the police radar or whether it was receiving away from the police. Ah, radar. But if the driver was approaching the police radar than the final frequency observed by the police, radar would be creator. And if the driver was receiving away from the police regard and the final observed frequency would be smaller than NATO, the frequency off the immediate source where well, in in either case, both frequencies would result the radar to detect the same beat frequency. And in both cases the guard would have the same relative lost e but with opposite signs. And knowing this, we would stick toe either of the two frequencies to try to find the relative the lost two of the guard Ah, say that the card is approaching the police radar and the Doppler seek regions are used to find the observed frequency. But in the given case in this problem, we're actually, uh, have aware that reflected big from the guard to the radar, which means that this will have experience Doppler in fact twice where the first time The very expedience doctor, in fact, is when it is approached. We need approached the car where the frequency by with the radio benefits the Sechrest off the car is not the same. Is there off the microwave frequency emitted by the radar? But since the God is moving and approaching the radar as this would experience a Doppler, in fact, and here the detected frequency F D is a call to everything to one bliss redivided by See and here efforts physical to F d. Right. And therefore we can write, if not, is equal to efforting to one place we divided by C right? And let's solve for me uh, we is equal to ah screen Rudolph, if not divided by if not divided by f is minus one multiply by sea and plugging the values we musical too. Ah squared Rudolph A 33 point four 0000 39 divided by 33.4 minus one. Multiply by three, Multiply by 10 to the bomber eight and this uses 17 point 515 meter up for a second. And since this is uh a 29 meter per second speeds on then This driver was not speeding. The driver was not speeding is his speed walls 18 meter per second?