Physics · 2019
JEE Main · 9 April 2019, Shift 2 · Q14
Two cars A and B are moving away from each other in opposite directions. Both the cars are moving with a speed of 20 ms^-1 with respect to the…
Two cars A and B are moving away from each other in opposite directions. Both the cars are moving with a speed of $\displaystyle 20 \mathrm{~ms}^{-1}$ with respect to the ground. If an observer in car A detects a frequency $\displaystyle 2000$ Hz of the sound coming from car B, what is the natural frequency of the sound source in car B ?
(speed of sound in air $\displaystyle =340 \mathrm{~ms}^{-1}$ )
Official answer
(3)
$\displaystyle 2250$ Hz
More from Waves
- Two loudspeakers ( L_1 and L_2 ) are placed with a separation of 10 m, as shown in figure. Both speakers are fed with an audio input signal of same…2026
- A travelling wave is described by the equation y(x, t)=[0.05 sin (8 x-4 t)] m The velocity of the wave is: [all the quantities are in SI unit]2023
- The equation of a wave travelling on a string is y= sin [20 π x+10 π t], where x and t are distance and time in SI units. The minimum distance…2025
- A tuning fork is vibrating at 250 Hz. The length of the shortest closed organ pipe that will resonate with the tuning fork will be \ \ \ \ cm. (Take…2021
- In an experiment with sonometer when a mass of 180 g is attached to the string, it vibrates with fundamental frequency of 30 Hz. When a mass m is…2023
- A source and a detector move away from each other in absence of wind with a speed of 20 m/s with respect to the ground. If the detector detects a…2021
- Two waves are simultaneously passing through a string and their equations are: y_1=A_1 sin k(x-vt), y_2=A_2 sin k(x-vt+x_0). Given amplitudes A_1=12…2021
- A student is performing the experiment of resonance column. The diameter of the column tube is 6 cm. The frequency of the tuning fork is 504 Hz.…2021
JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.