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
Amanda [17]
3 years ago
9

The Doppler effect is an effect produced by a moving source of sound or electromagnetic waves due to the relative motion of a so

urce or a receiver. If an emergency vehicle approaches Bob and moves away from Jill, how does the frequency of the siren change? A) Neither Bob or Jill perceive any change in the frequency of the siren. B) As an emergency vehicle approaches Bob the frequency appears to increase. C) As an emergency vehicle moves away from Jill the frequency appears to increase. D) Bob does not notice any change until the vehicle passes him and the siren increases.
Physics
2 answers:
Len [333]3 years ago
8 0

Answer:

B) As an emergency vehicle approaches Bob the frequency appears to increase.

Explanation:

As mentioned Doppler effect is related to the waves produced by a moving source. When moving towards the observer, the frequency of the wave will seem to increase and while moving away from the observer, the frequency will seem to decrease.

Here, the vehicle is moving towards Bob and away from Jill. This means, the frequency of the siren will seem to increase while approaching Bob and frequency will seem to decrease while moving away from Jill.

xxMikexx [17]3 years ago
4 0
B. The waves would shorten as the vehicle got closer
You might be interested in
Ele is playing with a ball in a bus that moves in a straight line with constant velocity What can you say about the motion of th
cupoosta [38]

Answer:

The ball will fall back and land to Elle's hands.

Explanation:

The bus move in a straight line with constant velocity means that there is no change of direction and no acceleration. Inertia can change the direction of the ball and acceleration can change its velocity. Since these two factors is not present in this scenario, the ball only has vertical movement. Thus the ball will land where it was thrown, in Elle's hands.

6 0
3 years ago
Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distanc
kumpel [21]

Answer:\frac{D_A}{v_B-v_A}

Explanation:

Given

car A had a head start of D_A

and it starts at x=0 and t=0

Car B has to travel a distance of D_A and d_a

where d_a is the distance travel by car A in time t

distance travel by car A is

d_a=v_A\times t

For car B with  speed v_B

d_B=D_A+d_a

v_B\times t=D_A+v_A\times t

t=\frac{D_A}{v_B-v_A}

7 0
3 years ago
Bettina spoke into a microphone during the school play to increase the sound of her voice so the audience could hear her speak.
grandymaker [24]
The loudness was increased by the amplifier which converted electrical energy into sound energy.
7 0
3 years ago
Read 2 more answers
a device employing a lens, shutter, and persistent light source that projects images from glass slides onto a flat white wall or
seraphim [82]

A device employing a lens, shutter, and persistent light source that projects images from glass slides onto a flat white wall or cloth drape hung in the dark is image projection began with the MAGIC LANTERN

<h3><u>Explanation:</u></h3>

The magic lantern works on the sliding runner technology. The image can be made larger in size and can be projected with the help of an optical device. When the technology of motion toy become older, this magic lantern is the modernized version of the motion toy technology. The modernization of the magic lantern was as an alternative of to motion-toy technology.

The photos and images that are taken can be increased in the size and projection can be made. These images can be enlarged in size by the help of a photographic images. this helps in image and also in taking photographs. This photographic image can be attached with Magic lantern. A long slide of glass helps in projecting the image on the walls or cloth drapes using magic lantern. This gives life to Shadows.

6 0
3 years ago
Read 2 more answers
A thunderstorm loses energy in the _______ stage.
Irina-Kira [14]
 dissipation is the answer ;(
3 0
3 years ago
Read 2 more answers
Other questions:
  • A 10-kilogram bicycle is traveling at a speed of 2m/s. what is the bike's kinetice energy?
    5·1 answer
  • A projectile is launched with an initial velocity of 25 m/s at an angle of 30° above the horizontal. The projectile reaches maxi
    14·1 answer
  • Tyler throws a baseball, which accidentally breaks a window in his neighbor's house. Which of the following represents the actio
    12·2 answers
  • A car has a mass of 2,000kg and is traveling at 28 meters per second what is the car's kinetic energy
    14·1 answer
  • Two spheres of equal mass, A and B. are projected off the edge of a 2.0 m bench. Sphere A has a horizontal velocity of 5.0 m/s a
    5·1 answer
  • Volume of 10 coin is 25ml what is the volume of 1 coin
    10·1 answer
  • B. Interpret Data Solution A has a pH of 1.6.
    11·1 answer
  • How much heat is required to convert 190 g of ice at -3°C to water at 3°C?
    10·1 answer
  • Science, who ever answers this will get a brainlest
    12·1 answer
  • If a runner exerts 457 j of work to make 321 w of power then how long did it take the runner to do the work
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!