A person who is not moving measures the speed and wavelength of the sound produced by a horn on a vehicle that is also not moving. The person then carries out the measurements again while the vehicle is moving towards them at a constant speed. Which row states the measured wavelength and the measured speed of the sound wave from the moving vehicle in comparison with the sound wave from the vehicle at rest?
- Awavelength: longer, speed: greater
- Bwavelength: shorter, speed: greater
- Cwavelength: longer, speed: same
- Dwavelength: shorter, speed: same