Question

A.R.Rahman is conducting a musical night in an open auditorium in New York. If two persons, one who is sitting in the auditorium at a distance of $250m$ from the stage and the other who is watching the live program on a television set sitting in front of it in Hyderabad, then the person who will hear him first:
A) Person sitting in auditorium
B) Person sitting in Hyderabad
C) Both will here at a time
D) Cannot be said

Answer 1

Hint: In conducting wires, the accelerated motion of charges results in the production of radio waves. Radio waves are very fast waves. It can travel at the speed of light in particular vacuum. These waves are well used for communication technologies such as radios, television, mobile phones. We already know that the average speed of the particular sound in air is $330m{s^{ - 1}}$.

Complete step by step solution:
It is given that the person in the audience is at a distance $250m$ in the auditorium. To find the person who will hear him first.
To produce sound waves, firstly the communication devices receive radio waves and convert them into mechanical vibrations in a speaker.
A live video camera recorded a musical night show. This video is converted into radio waves and it gets transmitted to the television. The television then converts the radio waves into normal video type and it is telecasted in the television set. We know that Radio waves are electromagnetic waves. First the person sitting in Hyderabad will be here and sounds good. The electromagnetic waves travel with the speed of light $3 \times {10^8}m{s^{ - 1}}$.
Hence the person who is watching the musical night show on a television set in Hyderabad will hear first.

Hence the correct option (B), Person sitting in Hyderabad.

Note: In $1880$ the physicist Heinrich Hertz proved the existence of radio waves. To produce the radio waves, the current passing through the transmitter antenna makes electrons vibrate up and down. The radio waves have the ability to pass through the whole atmosphere. The high frequency radio waves are not dangerous. Generally the frequency ranges from $500KHz$ to $1000MHz$. Sound waves travel through air or water medium.