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# Doppler Shift

### Doppler effect: when a visible light is receding, its color will?

When a visible light is receding, its color will? a. shift toward the blue end of the spectrum b. shift toward the red end of the spectrum c. no change in the slightest

### Doppler effect

The predominant frequency of a certain police car's siren is 1550Hz when at rest. What frequency do you detect if you move with a speed of 30.0m/s (a) toward the car, and (b) away from the car?

### Range Difference and Radar Problem

See the attached files. Part a of the problem - word document - requires determination of the range at point C and P then determining the difference. I'm unsure if I need to concern myself with the Taylor series expansion of the range equation. In essence I opted to determine theta then solve for R using the range equation

### The Doppler Effect

A source of sound waves of frequency 1.0 kHz is stationary. An observer is traveling at 0.50 times the speed of sound. What is the observed frequency if the observer moves toward the source? What is the observed frequency if the observer moves away from the source instead?

### What is the Doppler effect? Frequency of the sound shift.

What is the Doppler effect? Assume that a sound source is moving toward a sound detector at a speed of 60 m/s. According to the stationary detector, by what fraction does the frequency of the sound shift? Assume the speed of sound to be 330 m/s. Will the frequency appear to be higher or lower? Assume now police operated microwav

### Determine beat frequency from a ultrasound wave reflected in oncoming bloodstream

Ultrasound reflected from an oncoming bloodstream that is moving at a 30 cm/s is mixed with the original frequency of 2.5 MHz to produce beats. What is the beat frequency? (Velocity of sound in blood = 1540 m/s.) Beat frequency = in Hz

### Doppler effect: Frequency the car horns emit when one is at rest and the other moving

Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward an observer at 15.9m/s, a beat frequency of 5.60Hz is heard. What is the frequency the horns emit? Assume T= 20 degrees celsuis

### Frequency of Sue's scream in the cave and calculate distance

John and Sue are descending on ropes into a cave. Sue's rope breaks and she falls screaming past John. Apply doppler effect. John, hanging stationary on a rope in an underground cave, hears Sue screaming with frequency f as she falls past him with constant terminal speed S= 53 m/sec. While she is above him, he receives her sc

### Sound frequency and/or wavelength changes due to motion

A truck is moving at 50 m/sec while its horn emits a steady note at 280 cy/sec. A woman is stationary, 150 meters ahead of the truck. A man is in a car, 200 meters ahead of the truck, moving toward the truck at a speed of 30 m/sec. The speed of the sound is 345 m/sec. PART a. Find the frequency heard by the woman. PART b.

### Sound frequency heard by observer some distance from battery

A Battery-operated toy emites a signal at 1800Hz. It moves in a circle of a radius 1.2 m at 2.4 revolutions per seconds. What are the minimium and maximum frequencies heard by a stationary observer some distance away in the plane of the circle? Assume the speed of sound is 330 ms-1

### Velocity, frequency of sound

1.A supersonic jet traveling at Mach 3 at an altitude of 20000m is directly overhead at time t=0. A) How long will it be before the ground observer encounters the shock wave? B)Where will the plane be when it is finally heard?(Assume an average value of 330m/s for speed of sound in air) I will send what I have for this one

### Calculating the speed of an approaching vehicle given the frequency of a car horn.

A student in a parked car honks the horn, which has a `proper' frequency of 300 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 329 Hz. Calculate the speed of the approaching vehicle. Use 343 m/s as the speed of sound in air.

### The Doppler Effect Applied to the Whistle of a Train

A sound detector is placed on a railway platform. A train, approaching the platform at a speed of 36km/h sounds its whistle. The detector detects 12 kHz as the most dominant frequency in the whistle. If the train stops at the platform and sounds the whistle, what would be the most dominant frequency detected? The speed of sound

### Lorentz Transformation and the Doppler Effect

The radar speed trap operates on a frequency of 10^9 Hz. What is the beat frequency between the transmitted signal and one received after reflection from a car moving at 30 m/sec?

### Sound Waves

The ear has a protective overload mechanism called the "acoustic reflex". A sound in excess of about 85 dB causes muscles attached to the eardrum and ossicles to engage, which provides a safety margin of about 20 dB or 30 dB (the equivalent of ear plugs). This reflex takes about 30 ms to 40 ms to cut in, and maximum effect only