A stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. Compared to the emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a(1)longer wavelength
(2)higher speed
(3)longer period
(4)higher frequency

Answers

Answer 1

Answer:

Answer: The correct answer is higher frequency.

Explanation:

Doppler's effect is defined as the apparent change in the frequency of an electromagnetic wave due to the relative motion of an observer and source.

In the given problem, a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. In this case, there will be higher frequency.

If a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving away the officer. In this case, there will be smaller frequency but will have a longer wavelength.

Therefore, the radio waves reflected from the vehicle and received by the radar gun have a higher frequency.

Answer 2

Answer:

The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.

What is the Doppler effect?

A sudden change in the frequency due to the distance between the objects and source is explained by the doppler effect.

As the source and observer travel toward each other, the frequency of sound, light, or other waves increases or decreases.

The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.

Hence option 4 is correct.

To learn more about the doppler effect refer to the link;

brainly.com/question/15318474

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When Emma pushes a bag with a force of 27 newtons, the coefficient of kinetic friction between the bag and the floor is 0.23. What is the normal force acting on the bag by the floor?

10 pointsTrue or False? Charging by friction happens when you rub two objects
together and PROTONS move from one object to the other.

Answers

Answer:

true

Explanation:

yes because I said so

What has to be different to allow refraction to occur?a. the medium
b. the light
c. the wave
d. the speed

Answers

a. the medium

For refraction to occur, there has to be change from one medium to another. For example rays of light would refract as the travel from air to water.

Unless an object at rest is acted upon by a force, it stays at rest due to its

Answers

There are a lot of things about this whole statement that bother me,
but I'm pretty sure you're not interested in those. You just want a word
to glue onto the end and complete the statement. OK. Use "inertia".

Which statement BEST describes how the body moves?a. Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.
b. Cardiac and smooth muscles are made of muscle fibers, nerves, and cartilage and are responsible for all movement in the body.
c. Smooth muscles, which are made of blood vessels, fibers, and nerves, allow for all activities that use slow-twitch muscle fibers.
d. Skeletal muscles, which are made of tendons, nerves, and fibers, line the body cavities and allow for support and movement.

Answers

Answer;

A. Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.

Explanation;

Muscular tissues functions in movement and locomotion through its direct connection with the skeletal system.
Skeletal muscles are responsible for moving the body. The skeletal muscle contractions pull on tendons, which as attached to bones. When the skeletal muscle contraction causes the muscle to shorten, the bone and thus the body par will move.
Skeletal muscles also provide structural support for the entire body.

Answer:

Skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.

Explanation:

Which would be heavier—A ball of lead with a diameter of 2.00 cm or a cylinder of iron with a diameter of 3.00 cm and height of 8.00 cm.

Answers

Explanation:

i think a ball of lead with a diameter of 2.00 cm heavier

You drop your backpack out of a window from a height of 8.3 m. What is the impact speed of your backpack?A. 163 m/s
B. 1.2 m/s
C. 21.3 m/s
D. 12.8 m/s

Answers

the answer is 12.8 on apex

Final answer:

The impact speed of the backpack is approximately 12.8 m/s.

Explanation:

To calculate the impact speed of the backpack, we can use the principle of conservation of energy. The potential energy of the backpack at the top of the window is converted into kinetic energy at the bottom. Assuming no air resistance, we can equate the potential energy to the kinetic energy:

mgh = 1/2mv^2

Here, m is the mass of the backpack, g is the acceleration due to gravity (9.8 m/s^2), and h is the height of the window (8.3 m). By rearranging the equation and solving for v, we can find the impact speed of the backpack.

Using the given values:

v = sqrt(2gh) = sqrt(2 * 9.8 * 8.3) ≈ 12.8 m/s