<prompt> Hlalosa motheo oa motheo bakeng sa ketsahalo e fanoeng ea saense.Phello ea Doppler  <response>: Instruction in English: Explain the underlying principle for the given scientific phenomenon. . Response in English: The Doppler effect is an observed shift in the frequency and wavelength of waves produced by a moving source relative to an observer. The principle underlying this phenomenon is that the motion of the source causes a change in the relative position between the observer and the wavefronts emitted by the source. This results in a compression or expansion of the waves, perceived as a change in their frequency and wavelength.For instance, when the source of the waves is moving towards the observer, the waves are compressed and their frequency appears to increase, resulting in a higher pitch sound or a shift to the blue end of the light spectrum. Conversely, when the source is moving away from the observer, the waves are stretched and their frequency appears to decrease, resulting in a lower pitch sound or a shift to the red end of the light spectrum.This effect is commonly observed in everyday life, for example when the siren of an approaching ambulance sounds higher-pitched and then becomes lower-pitched as it moves away. It also has many practical applications, such as the use of radar to measure the speed of vehicles or Doppler ultrasound to monitor blood flow in the body. . Response in Sesotho: Phello ea Doppler ke phetoho e hlokomelehang ea maqhubu le bolelele ba maqhubu a hlahisoang ke mohloli o tsamaeang o amanang le moshebelli. Molao-motheo o thehiloeng ketsahalong ena ke hore ho sisinyeha ha mohloli ho baka phetoho sebakeng se lekanyelitsoeng pakeng tsa moshebelli le maqhubu a hlahisoang ke mohloli. Sena se fella ka ho hatelloa kapa ho atolosoa ha maqhubu, ho nkoang e le phetoho ea maqhubu a ona le bolelele ba maqhubu. Ka mohlala, ha maqhubu a fihla ho motho ea shebelletseng, maqhubu aa hatelloa me ho bonahala maqhubu a ona a eketseha, e leng se etsang hore ho be le molumo o phahameng haholoanyane kapa ho fetohela karolong e mala o moputsoa oa lebone la khanya. Ka lehlakoreng le leng, ha mohloli o suthela hōle le motho ea shebileng, maqhubu aa otloloha me maqhubu a ona a bonahala a fokotseha, e leng se etsang hore ho be le molumo o tlaase kapa ho fetohela ntlheng e khubelu ea lebone la khanya. Phello ena e atisa ho hlokomeloa bophelong ba letsatsi le leng le le leng, ka mohlala ha siren ea ambulense e atamelang e utloahala e le holimo-limo ebe e fetoha e tlaase ha e tloha. E boetse e na le litsebetso tse ngata tse sebetsang, joalo ka tšebeliso ea radar ho lekanya lebelo la likoloi kapa Doppler ultrasound ho lekola phallo ea mali meleng. 