When an ambulance passes by, the siren’s pitch changes.  The sounds becomes higher-pitched as it approaches, and then the pitch lowers as it gets further away.  This change in pitch is known as the Doppler effect.  What causes this change in pitch?   The waves emitted by an object moving toward an observer are squeezed, and frequency appears to increase. The waves emitted by an object moving away from an observer are squeezed, and frequency appears to increase. The waves emitted by an object moving toward an observer are stretched, and frequency appears to decrease. The waves emitted by an object moving toward an observer are stretched, and frequency appears to increase.

Q: A sound of 50 dB is O 16 times as loud as a sound of 20 dB 10 times as loud as a sound of 20 dB…

A:

Q: Two trains, each moving with a velocity of 30m/s, cross each other. One of the trains gives a…

A: D

Q: Waves travel along a 100-m length of string which has a mass of 55 grams and is held taut with a…

A:

Q: The Doppler effect is a change in the observed frequency of a wave (such as a sound wave or light…

A: (a)Frequency in terms of velocity

Q: a listener in an automobile is moving at 60 m/s toward a fire truck that's moving toward the…

A: Given:The speed of a listener in an automobile moving toward a fire truck is vo = 60 m/s The…

Q: Its mass is 1.6689 x 10-27 kg, and it is accompanied in its motion by a wave of length 1.97735 x 10…

A: This question can be solved by using rules of the quantum mechanics involved wavelength and dual…

Q: we are moving away from a stationary cell phone tower at 25 m/s. If the frequency emitted by the…

A:

Q: What are the frequency and wavelength of the waves produced in the air when the string with one…

A: As the string vibrates, the sound wave is produced and the frequency of the sound is equal to the…

Q: If the wavelength of a sound wave of frequency 250 Hz is 1.4 m, calculate the speed of the wave. * O…

A: Given,  The wavelength of the sound wave λ =1.4 m. The frequency of the sound wave (f) = 250 Hz.

Q: A sound wave has a speed of 340m / s and a wavelength of 15 m. What is the frequency of the sound…

A: Given data:  Speed (v) = 340 m/s Wavelength (λ) = 15 m Required: Frequency (f)

Q: A railroad train is traveling at 25 m/s. The frequency of the note emitted by the locomotive whistle…

A:

Q: You are standing still at a railroad crossing when the driver of the train sounds its whistle. You…

A: Given: A train whistles

Q: Red Light in air has a frequency of 4.3 x 104 Hz. What is the speed in glass for red light if it has…

A:

Q: A musical note on a piano has a frequency of 45 Hz. If the tension in the 2-m string is 308 N, and…

A: Given that, Frequency = 45 Hz Tension =308 N

Q: The siren on a train emits a sound wave with a frequency of 900 Hz. The train is stationary and you…

A:

Q: A sound wave travelling in a dense medium has a frequency of 20 KHz and a wavelength of 40 cm. What…

A: Write the expression for the speed of the waveform. Here, n represents the frequency and λ…

Q: Alysson joins a race. She is running at a constant pace of 2m/s. Eve, another runner who enjoys…

A: Sound waves are longitudinal waves which imply that these waves travel in a direction parallel to…

Q: ng a highway with heavy traffic. A stationary car with an audio irns on its siren of 700-Hz…

A:

Q: An ambulance siren has a frequency of 1200 Hz and is moving towards you with a speed of 22 m/s.…

A: The number of waves flowing through a spot in a unit of time is known as frequency. The distance…

Q: AM radio signals are broadcast at frequencies between 550 kHz (kilohertz) and 1600 kHz and travel at…

A:

Q: The crests of a wave pass an observer 5 times every minute. If the crests are spaced 15 cm apart,…

A:

Q: Diamagnetic materials exhibit

A: Diamagnetic material are those material which exhibit the induced magnetic field in opposite…

Q: nign. windows, door, 1.2 m x 2 m. wide. Each surface has an Absorption coefficient of 1,000 Hz as…

A: Absorption coefficient: Absorption coefficient definitions. a measure of the rate at which…

Q: # 18. A police car sounding a siren with a frequency of 1.580 [kHz] is km] traveling at 120.0…

A: Frequency=1.580khz,,Speed=120.To find,a)In car approach:     Frequency observed=?  In car receded:…

Q: You are riding your bike down a hill at a speed of 7 m/s (~15 mph) and a stationary bell is ringing…

A: Given: The speed of the person down the hill is 7 m/s. The frequency from the bell is 320 Hz. The…

Q: We stand in front of a wall. Between us and the wall, at the height of our ears, there is a…

A: Given data, Actual frequency of the whistle = 600 Hz Beat frequency = 3 Hz

Q: A car approaches a reflective wall. An observer at rest behind the car hears a sound of frequency f1…

A:

Q: A 3rd harmonic is being produced in a tube that is open at both ends.  The tube is 3 meters long and…

A: See below

Q: The speed of sound in steel is 15 times greater than that in air. If the frequency of a wave in the…

A: Speed of sound in air = 343 m/s Speed of sound in steel = 15 * 343  = 5145 m/s Frequency of wave =…

Q: The Doppler effect can be used to measure flow rates in blood. A sound wave is transmitted into a…

A:

Q: The ambulance siren emits a sound with a frequency of 450 Hz. What is the wavelength of the sound?…

A: frequency of siren when stationery, fs= 450Hz Speed of sound in air = 340 m/s Vehicle speed ( moving…

Q: A student wants to establish a standing wave on a wire 2 m long clamped at both ends. If the wave…

A: Given: Length standing wave on wire,L=2 mWave of speed,v=72 m/s,n=1

Q: We now consider two sound waves with different frequencies which have to the same amplitude. The…

A: Given: A=1m, f1=1000Hz, f2=1050Hz The two sound waves are expressed as : y1 (t) = A sin (2πf1t) y2…

Q: A musical note on a piano has a frequency of 45 Hz. If the tension in the 2-m string is 308 N, and…

A:

Q: A whale makes a sound in the water with a frequency of 300 Hz sound moves at a speed of 1400 n/s in…

A:

Q: A wave has velocity (240m / s) and wavelength (3.2), so the frequency of the wave is equal to: 768Hz…

A: Given:         velocity of wave (v)=240m/s         wavelength of wave(λ)=3.2mwe know that v=λf

Q: A student shares a surgical tubing in the lab. The tension on the tubing is 50N. The student…

A: given that Length = 2 m    Fourth  frequency = 20 hz       Tension = 50 N        Linear mass density…

Q: The bending or spreading out of a wave at an obstacle or at the edges of an opening is called…

A: As we know the relation between wavelength and frequency. The wavelength is equal to the ratio of…

Q: Hassan is driving his truck with a velocity of 18m/s towards a mountain. Kevin who is riding in the…

A:

Equation of Waves

Wave is an oscillation or disturbance traveling in a medium. It performs the transportation of energy but does not carry any matter. This motion of waves will transport fuel in a medium without permanent transfer of mass (particle).