1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ganezh [65]
1 year ago
5

A physicist drives through a stop light. When he is pulled over, he tells the police officer that the Doppler shift made the red

light of wavelength 650nm appear green to him, with a wavelength of 520nm . The police officer writes out a traffic citation for speeding. How fast was the physicist traveling, according to his own testimony?
Physics
1 answer:
Orlov [11]1 year ago
5 0

The physicist traveling, according to his own testimony at -6.6 × 10⁷ m/s.

<h3>How fast was the physicist traveling, according to his own testimony?</h3>

Using the formula for doppler shift for light,

λ' = λ√[(1 + v/c)/(1 - v/c)] where

  • λ = wavelength of source,
  • λ' = wavelength of observer,
  • v = speed of source and
  • c = speed of light

Given that the driver is moving away from the stop light, we take the driver as the source. Since, the Doppler shift made the red light of wavelength 650nm appear green to him, with a wavelength of 520nm. we have

  • λ' = wavelength of source = 650 nm,
  • λ' = wavelength of observer = 520 nm

So, substituting the values of the variables into the equation, we have

λ' = λ√[(1 + v/c)/(1 - v/c)]

520 nm = 650 nm√[(1 + v/c)/(1 - v/c)]

520/650 = √[(1 + v/c)/(1 - v/c)]

0.8 = √[(1 + v/c)/(1 - v/c)]

Squaring both sides, we have

0.8² = (1 + v/c)/(1 - v/c)

0.64 = (1 + v/c)/(1 - v/c)

0.64(1 - v/c) = (1 + v/c)

0.64 - 0.64v/c = 1 + v/c

0.64 - 1 = v/c + 0.64v/c

-0.36 = 1.64v/c

-0.2195 = v/c

v = -0.22c

v = -0.22 × 3 × 10⁸ m/s

v = -0.66 × 10⁸ m/s

v = -6.6 × 10⁷ m/s

So, the physicist traveling, according to his own testimony at -6.6 × 10⁷ m/s.

Learn more about doppler shift for light here:

brainly.com/question/28499579

#SPJ1

You might be interested in
Sounds are produced by objects that are______
ahrayia [7]

Answer: Vibrating

Explanation:

Sound is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound is a form of mechanical energy.

7 0
3 years ago
Remy wonders if the height of the mountain has anything to do with the eventual size of the tsunami wave. How should Remy test t
Anna71 [15]

Answer:

<em>The answer is B</em>

Explanation:

<em>I got this from study island</em>

5 0
3 years ago
Which statement is NOT evidence of the plate tectonic theory?<br> PLS SOMEONE HELP QUICK
alex41 [277]

Answer:

what are the statements?

Explanation:

8 0
3 years ago
A car accelerates from 20 m\s to 30 m\s in 2 seconds. What is the average acceleration of the car?
Morgarella [4.7K]

Answer: Acceleration =5m/s^2

Explanation:

3 0
2 years ago
Which of the following best describes a magnet?
12345 [234]
C
Because magnet involves 2 opposite poles so therefore it would have to be C
8 0
3 years ago
Read 2 more answers
Other questions:
  • A gas sample occupies 4.2 L at a pressure of 101 kPa. What volume will it occupy if the pressure is increased to 235 kPa?
    7·2 answers
  • The power needed to operate your body is about 100 watts. suppose a human body (of typical mass) could run on fusion power and c
    14·1 answer
  • A group of elements are highly inactive and are used by chemists because of their chemical stability.
    10·1 answer
  • Explain the roles of products, reactants, and limiting reactant in chemical reaction.
    8·1 answer
  • An object of mass m moves horizontally, increasing in speed from 0 to v in a time t. The power necessary to accelerate the objec
    9·1 answer
  • What is the Real anti virus software?
    15·2 answers
  • Why is the meteor shower is best observed after midnight?​
    12·1 answer
  • A meterstick is placed on a pivot point of 42.5cm and a 45g mass is hung at the 20cm mark. When released the meterstick remains
    9·2 answers
  • An object takes 2.8 years to orbit the Sun. What is its average distance (in AU) from the Sun?
    8·1 answer
  • The displacement of a 500 g mass, undergoing simple harmonic motion, is defined by the function :
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!