Question

In: Physics

QUESTION 2 The Doppler Effect may be used to determine the relative velocity of objects, such...

QUESTION 2 The Doppler Effect may be used to determine the relative velocity of objects, such as cars on the highway, or stars in the galaxy. When the OBSERVED frequency appears to increase, relative to the source, this means ... ...

the source is moving AWAY FROM the observer.

... the source is moving at the same speed as the observer.

... the source is moving TOWARDS the observer.

... the source and the observer are motionless.

Expert Solution

The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. The relationship between observed frequency fo and emitted frequency fs is given by:

Let us consider the source and observer is moving along X-axes. The velocity will be positive if they are moving +Ve X-direction.

Here, in your problem, the observed frequency (fo) appears to increase, relative to the source frequency (fs). Therefore, you can write

Now you consider the four cases in your problem.

(a) the source is moving AWAY FROM the observer:

Let us consider the observer is at rest and the source is moving away from the observer with a relative velocity vs, then you can write from the above equation

Hence, this option is not true.

(b) the source is moving at the same speed as the observer:

There will be two cases -

(i) If the source and the observer is moving at same speed (v) and they move towards each others, then the equation will be

This condition will be true for your case.

(ii) If the source and the observer is moving at same speed (v) and they move away from each others, then the equation will be

This option will not be true for your case

(c) the source is moving TOWARDS the observer:

Let us consider the observer is at rest and the source is moving towards the observer with a relative velocity vs, then you can write from the above equation

This condition will be true for your case.

(d) the source and the observer are motionless:

The speed of observer and the source are zero. Then from the equation, you will obtain that

This option also not true.

genius_generous answered 1 year ago

Given 2 objects moving at some velocity v relative to one another, is it possible to...

Given 2 objects moving at some velocity v relative to one another, is it possible to determine whether they are moving or whether the space between them is expanding?

The Doppler effect - the shift in frequency/wavelength of a sound source when there is relative...

The Doppler effect - the shift in frequency/wavelength of a sound source when there is relative motion between source & observer - and a Sonic Boom - a conical region of compression that forms around the sound source when its speed exceeds the speed of sound in the medium of the source, and results in an observed "boom" when part of the cone passes the observer's location - are two interesting, common, as well as connected phenomena seen this week....

2. If each of the following objects are rotating with the same angular velocity, ?, which...

2. If each of the following objects are rotating with the same angular velocity, ?, which would be the hardest to stop? (i.e., require the largest amount of work). A hoop with mass (1/2)M and radius 2R rotating about its cylinder axis. A solid cylinder with mass 4M and radius (3/4)R rotating about its cylinder axis. A solid sphere with mass 8M and radius (2/3)R rotating about any diameter. A hoop with mass 4M and radius (1/2)R rotating about its...

2. a) Why does the Doppler effect differ in the case where the source moves to...

2. a) Why does the Doppler effect differ in the case where the source moves to the fixed observer, from the one in which the observer moves to a fixed source? b) Explain what the resonance effect consists of. Give an example. Please answer the questions with maths! and explain physically, thank you in advance !

Question 2: You want to determine if there are any Kuiper Belt objects larger than Eris....

Question 2: You want to determine if there are any Kuiper Belt objects larger than Eris. Part a: Describe the observational methods and analysis you would apply to search for them. Part b: How might you determine if any candidate objects are larger than Eris? What observational data do you need for an object to estimate its radius?

What is the common ion effect and how may the common ion effect be used to...

What is the common ion effect and how may the common ion effect be used to prevent the dissolution of certain sparingly soluble salts into water solution? Calculate the concentration of CaF2 in 0.002 M KF.

For this question (Determine the velocity of the 60 kg block A if the two blocks...

For this question (Determine the velocity of the 60 kg block A if the two blocks are released from rest and the 40 kg block B moves 0.6 m up the in cline. The coefficient of kinetic friction between both blocks and the inclined planes is = 0.05.), how is T(2) = 110 V(a)^2 instead of T(2) = -50V(a)^2

2. The Doppler ultrasonic stethoscope is used to: A. Assess lower extremity skin condition B. Detect...

2. The Doppler ultrasonic stethoscope is used to: A. Assess lower extremity skin condition B. Detect a weak pulse C. Rate the force of a peripheral pulse D. Assess pitting edema 3. Where will the nurse palpate the posterior tibial pulse? a. In the groove between the medial maleolus and the Achilles tendon b. Just lateral to and parallel with the extensor tendon of the big toe c. In the groove between the external maleolus and the Achilles tendon d....

QUESTION 13 In order to determine the velocity of money, we need to know: a....

QUESTION 13 In order to determine the velocity of money, we need to know: a. the interest rate and nominal GDP. b. the money supply and the price level. c. the money supply and nominal GDP. d. nominal GDP and real GDP. QUESTION 14 The money supply and money demand curves are _____ and ______ respectively. a. Vertical; downward sloping. b. Upward sloping; vertical c. Upward sloping, downward sloping d. ...

We are going to look at how the radial velocity method can be used to determine...

We are going to look at how the radial velocity method can be used to determine the mass of a planet. The observations that get made look at two things: the wobble of the star (it is measured as a change in the speed the star appears to be traveling towards or away from us) and the amount of time it takes for the pattern to repeat itself. Let's consider the planet beta Gemini b. The change in the speed...