A physicist drives through a stop light. When he is pulled over, he tells the police officer that the Doppler shift made the red light of wavelength 680 nm appear green to him, with a wavelength of 515 nm. The police officer writes out a traffic citation for speeding. How fast was the physicist traveling, according to his own testimony?

The speed is

Explanation:

From the question we are told that

   The real  wavelength is  

   The observed  wavelength is

Generally the real wavelength of the stop light according to doppler effect is mathematically as

Here c is the speed of the light  

and  v is the speed of the physicist

So

=>    

=>    

=>  

=>  

=>  

=>  

=>  

substituting  for c

    =>    

    =>    

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!

this could be newton#'s law of cooling. the cooling curve is exponential