Plot review: Season 1 Episode 6, four otaku receive an invitation to Penny's Halloween party. In order to keep the appointment, all four of them dressed up as Flash. The four men looked at each other and decided through consultation that no one was allowed to wear flash clothes, so Sheldon changed into black and white striped clothes. When everyone thought that Sheldon was dressed as a zebra, "Little India" Raj was the first to reveal the secret. It turned out that Sheldon explained the Doppler effect of sound waves. ? In the play, when someone wants to question Sheldon's costume, he will persistently demonstrate this effect with his mouth and body. Although the Doppler effect only appeared in this episode, it left a deep impression on the audience, and many people went back to consult the knowledge about Doppler because of Sheldon's interpretation.

Interpretation of allusions: The so-called Doppler effect is based on the Austrian physicist Christian John Doppler (Christian? John. Doppler).1One day in the 1940s, Doppler passed a railway intersection, just as a train passed by him. He found that the tone of the train became sharper and sharper with the distance, and the whistle became weaker and lower with the distance of the train. He is very interested in this physical phenomenon. After research, he found that this is due to the relative motion between the vibration source and the observer, which makes the frequency of the sound heard by the observer different from that of the vibration source. When Sheldon put this important theory of physics on his body, everyone thought he was playing with zebras except for the recognition of three other tech geeks.