Doppler Effect ທີ່ໃກ້ເຂົ້າມາຄິດໄລ່ເຄື່ອງຄິດໄລ່ແຫຼ່ງຂໍ້ມູນ

I want to calculate
Wave Velocity(v) = m/s
Wavelength in Front of Source(λf) = m
New Frequency of Approaching Source(f') = Hz
   
Doppler Effect ທີ່ໃກ້ເຂົ້າມາຄິດໄລ່ເຄື່ອງຄິດໄລ່ແຫຼ່ງຂໍ້ມູນ