![]() The Doppler effect is responsible for the Blue Shift or Red Shift phenomenon observed in light waves. The Doppler effect applies to all types of waves, including sound and light. So, that is the reason behind the difference in the pitch of the sound of the ambulance siren while it is approaching and while it is moving away. When the ambulance is approaching us, the relative velocity is negative, and the relative velocity is positive when it is moving away. It happens because of the relative velocity between the source and the observer. For example, the pitch of the sound of an ambulance siren changes as it passes us. Based on the direction of the source and the observer and the magnitudes of their velocities, the observed frequency can be less or more than the source frequency. The Doppler effect or Doppler shift is a change (increase or decrease) in the frequency of a wave as the source and the observer move (towards or away from) each other relative to the medium. Difference between Gravitational Force and Electrostatic Forceĭoppler effect or Doppler shift phenomenon was described in 1842 by an Austrian physicist, Christian Doppler, and it is named after him.Difference between Coulomb Force and Gravitational Force. ![]() Difference between Center of Mass and Center of Gravity.Difference between Voltage Drop and Potential Difference.Difference Between Beer’s Law and Lambert’s Law.Difference between Rectilinear motion and Linear motion.Differences between ‘heat capacity’ and ‘specific heat capacity'.Difference Between Gravitation and Gravity.Difference between Antenna Gain measured in dB and dBi.Differences Between Horsepower and Torque.Difference Between Simple Pendulum and Compound Pendulum.Difference Between Kinetics and Kinematics.Difference between Wavelength and Frequency.Difference between Static Friction and Dynamic Friction.Difference Between PN Junction Diode and Zener Diode.Difference between Kinetic Energy and Potential Energy.Difference between Buoyancy and Buoyant Force.Software Engineering Interview Questions.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Commonly Asked Data Structure Interview Questions.Top 10 algorithms in Interview Questions.Top 20 Dynamic Programming Interview Questions.Top 20 Hashing Technique based Interview Questions.Top 50 Dynamic Programming (DP) Problems.Top 20 Greedy Algorithms Interview Questions.Top 100 DSA Interview Questions Topic-wise.
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