Doppler Effect for Sound Waves
1. A car driving at a velocity of 10 m s−1 toward an observer sounds its horn with a frequency of 10 kHz. The speed of sound in air is 330 m s−1.
What frequency does the observer hear?
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
Fig 1.1 is a diagram of a source that has a mass of 500 g and is connected to a rope of length 20 cm. The rope is attached to point Q and has a tension of 800 N. The source travels around point Q anticlockwise in a circular path with a velocity of vs. It emits a sound wave of frequency fs. When the source is at point P, an observer stands directly in line to the direction of motion at point O.
Fig 1.1
What is the value of vs and when the source is at point P?
Speed of sound, v = 340 m s-1
vs / m s-1 | ||
A. | 17.9 | 1.06 |
B. | 17.9 | 0.950 |
C. | 320 | 17.0 |
D. | 320 | 0.515 |
A police car siren emits a sound of 1.11 kHz.
Determine the frequency of the sound an observer would hear as the police car speeds toward them at 27 m s−1.
Speed of sound = 340 m s−1.
This question has 4 part(s).
This question has 4 part(s).
