An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s. a) 20.62Hz b) 19.40Hz c) 21.68Hz d) 22.63Hz
Q: a. What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 118 km/h…
A: *The ambulance moving at a speed is vs = 118 km/h = 32.78 m/s *The emitting frequency is f0 = 600 Hz…
Q: Two cars are each traveling at 27.0 m/s, and they are approaching each other. The security alarm in…
A:
Q: Two cars approach each other, each moving with a speed of 50 m/s, when one car starts to beep its…
A: Wavelength of the horn heard by the other driver. given, speed of carsvc=50 m·s-1frequencyf=475…
Q: A bee is emitting a frequency of 300Hz. The bee is flying towards you at 2m/s while you are running…
A: The observed frequency when the source is moving towards the observer and the observer is moving…
Q: Ultrasound reflected from an oncoming bloodstream that is moving at 21.0 cm/s is mixed with the…
A:
Q: You are traveling north on a highway moving at 23 m/sec. A police car is traveling toward you going…
A: It is given that
Q: If the sound intensity level of a plane engine is 140 dB above the threshold of hearing, the sound…
A: The sound intensity level of the engine, β=140 dB The threshold intensity, I0=10-12 W/m2
Q: Q14. A missile with a top speed of 3450 km/h is launched in the air. If the temperature of the air…
A: Speed of missile in air is 3450 km/h Temperature of air is 32oC = (32 + 273) K = 305 K Speed of…
Q: A fire truck emits a sound with frequency of 775Hz a. What is the frequency detected by stationary…
A: Doppler effect is the change in frequency of a wave due to relative motion of the observer and the…
Q: A projectile is fired at a velocity of 100 m s-¹ at an angle of 36° to the horizontal as shown…
A:
Q: As a bat flies toward a wall at a speed of 5.90 m/s , the bat emits an ultrasonic sound wave with…
A:
Q: A train travelling at 30 m/s sounds its horn (frequency 780 Hz) as it approaches a tunnel in a…
A:
Q: A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1390 Hz. The…
A:
Q: What is the sound intensity level in decibels for a sound wave traveling in air at 20°c and having a…
A: Pressure amplitude (P) = 0.5 Pa density (d) = 1.2 kgm3Speed of sound (v) = 343 ms
Q: A car is traveling due north at 26.1 m/s. A bicyclist behind the car is traveling at 16.5 m/s in the…
A:
Q: A sound wave radiates from a speaker in all directions. If the power of the sound source is 350 W,…
A:
Q: A bat is flitting about in a cave, navigating via ultrasonic bleeps. Assume that the sound emission…
A: Given that The original frequency of the bat, fs=37.1kHzfs=37100Hz The velocity of the bat…
Q: In a closed-air column, the temperature of the room is 10 °C and using a tuning fork with a…
A:
Q: A 760- Hz sound travels through pure neon. The wavelength of the sound is measured to be 0.57 m.…
A:
Q: A bat can detect small objects, such as an insect, whose size is approximately equal to one…
A: As we know that the wavelength is called to be the ratio of the speed of the wave to its frequency.…
Q: A typical adult ear has a surface area of 1.90 × 10³ m². The sound intensity during a normal…
A: The ear surface area A = 1.90 × 10- 3 m2 Sound intensity I = 2.04 × 10- 6 W/m2
Q: Air temperature in the Sahara Desert can reach 56.0°C (about 134°F). What is the speed of sound,…
A:
Q: A source of sound waves of frequency 1.00 kHz is traveling through the air at 0.800 times the speed…
A: Given frequency of emitted sound = f = 1.00 kHz speed of source = Vsource = 0.008 × Vsound We have…
Q: A race car is travelling at a speed of 262 km/hr. The frequency of the engines roar is 950 Hz. The…
A:
Q: a) A sound wave moves through the air. Its frequency is 522.32 Hz. The air temperature is 11 °C.…
A: Given data Frequency f = 522.32 Hz Air temperature T = 11 deg C We have to calculate the…
Q: A truck is moving at 35 meters/second. The car horn on the truck emits a 235 Hz sound. The speed of…
A: Given Speed of the truck is vs=35 m/s Speed of sound is given ass v=343 m/s Frequency emitted by the…
Q: b.) A sound has an initial volume of 55.0 dB. The volume suddenly increases to 87.0 dB. By what…
A: To find the factor by which the sound intensity increased, we can use the formula that relates the…
Q: The coldest recorded temperature of air on Earth, -128.6°F, occurred on July 21, 1983, at Vostok, a…
A: The given temperature of the air is, T=-128.6° F=5-128.6-329° C=-89.222° C=-89.222+273 K=183.778 K
Q: Young's modulus for steel is 20*10^10 N/m^2 and the density is 7.8*10^3 kg/m^3. The bulk modulus for…
A:
Q: Standing at a crosswalk, you hear a frequency of 560 Hz from the siren of an approaching ambulance.…
A:
Q: The warning tag on a lawn mower states that it produces noise at a level of 96.0 dB. What is this in…
A:
Q: At an air show, a jet is approaching you at a speed of 140 m/s. You hear the jet engine a frequency…
A:
Q: Tou are driving along a highway at 25.0 m/s when you hear the siren of a poli pproaching you from…
A: According to dopler's effect,frequency listen by listner. f1=V±VeV±VsfVe=speed of listner…
An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s.
a) 20.62Hz
b) 19.40Hz
c) 21.68Hz
d) 22.63Hz
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- 8. A source of sound waves of frequency 1.0 kHz is stationary. An observer is traveling at 0.50 times the speed of sound. Assume the speed of sound in air is 343 ms. a) b) What is the observed frequency if the observer moves toward the source? Repeat if the observer moves away from the source instead. [1.5 kHz; 500 Hz)2. You are in a car traveling at 25.0 m/s toward a pole-mounted warning siren. If the siren's frequency is 365 Hz, what frequency do you hear? Use the speed of sound 343 m/s.A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 51.0 kHz, and if the speed of sound in air is 340 m/s, what is the smallest insect a bat can detect?mm
- 9. A jet flies toward higher altitude at a constant speed of 1 963 m/s in a direction that makes an angle 0 with the horizontal (Fig.). An observer on the ground hears the jet for the first time when it is directly overhead. Determine the value of 0 if the speed of sound in air is 340 m/s.A pipe with one closed end vibrates with standing waves at the second harmonic. It produces a C- note that has a frequency of 264 Hz. How long is the pipe? The speed of sound in air is 340 m/s. 0.97 m 1.29 m 1.61 m 0.32 mAn ambulance with a siren emitting a frequency of 1600HZ overtakes and passes a cyclist pedaling a bike at 4 m/s. After being passed, the cyclist hears a frequency of 1590HZ. How fast is the ambulance moving? Temperature of air is 25°C. 2.
- A train approaches a station and sounds it's horn which has a natural frequency of 150 Hz. The train is traveling at 35.0 m/s and the speed in air is 340 m/s. A) What frequency does a person standing at the station hear? B) What frequency does a person sitting on the train hear?3. A bystander hears a siren vary in frequency from 598 Hz to 364 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) m/s f60 ss f60 s ssfo ssf60 sA convertible moves toward you and then passes you; all the while, its loudspeakers are producing a sound. The speed of the car is a constant 13.5 m/s, and the speed of sound is 344 m/s. What is the ratio of the frequency you hear while the car is approaching to the frequency you hear while the car is moving away?
- 1. A car is blowing its horn (f = 285Hz) while driving away from you at 18.0m/s. The air temperature is -12.0°C. a) What frequency do you hear? b) How fast would the car have to drive, and in what direction, for you to hear a frequency of 356Hz?An ambulance is traveling East at 40m/s. The siren emits a fixed frequency of 440Hz. Each of the following cars is traveling down the road as described. Rank the cars according to the frequency the driver will hear. 1. A car driving East at a speed of 40m/s. The car is in front of the ambulance. 2. A car driving East at a speed of 50m/s. The car is ahead of the ambulance.4. A car, sounding its horn, is moving at v. =158.4km / h directly toward a stationary wall in still air. The speed of sound, in the air, is v=330.0 m/s. The horn produces sound at a frequency of f. =1000.Hz (ie. if the car were stationary, that is the frequency you would hear). a) What frequency is heard by an observer at rest at the wall (assume the car is moving straight toward the observer)? b.) What is the wavelength, in the still air, of the sound wave approaching the wall? c) What is the frequency of the reflected sound heard by an occupant of the car?