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3 years ago

How does the doppler effect change wave speed?

1 answer:

4 0

It doesn't change wave speed at all.

It only changes the wavelength perceived by the observer
if he is moving toward or away from the source.

Notice that if one observer is moving toward a source, and another one
is moving away from the same source, then one observer would see an
abnormally long wavelength, and the other one would see an abnormally
short wavelength, both from the same source.

The Doppler Effect ... like beauty ... is in the eye of the observer.

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How can a person detect infrared rays without an instrument?

natita [175]

So we want to know how can we detect infrared rays without an instrument. Infrared rays or heat, are a part of electromagnetic spectrum. We have specialized nerve cells in our skin called thermoreceptors that can detect differences in temperature that are produced by infrared part of EM spectrum.

7 0

3 years ago

Read 2 more answers

A coffee filter of mass 1.2 grams dropped from a height of 1 m reaches the ground with a speed of 0.8 m/s. How much kinetic ener

iren [92.7K]

<u>Answer:</u> The energy gained by the air molecules is 0.011 J.

<u>Explanation:</u>

Law of conservation of energy states that energy can neither be created nor be destroyed but it can only be transformed from one form to another form.

Here, the potential energy of the coffee filter is getting converted into kinetic energy of the coffee filter and some energy is lost by it which is gained by the air molecules in the form of kinetic energy.

So, calculating the potential energy of coffee filter, we use the equation:

P = mgh

where,

m = mass of coffee filter = 1.2 g = $1.2\times 10^{-3}kg$ (Conversion used: 1 kg = 1000 g)

g = acceleration due to gravity = $9.8m/s^2$

h = height of coffee filter = 1 m

Putting values in above equation, we get:

$P=1.2\times 10^{-3}kg\times 9.8m/s^2\times 1m\\\\P=1.176\times 10^{-2}J$

Calculating the kinetic energy of coffee filter, we use the equation:

$E=\frac{1}{2}mv^2$

where,

m = mass of coffee filter = 1.2 g = $1.2\times 10^{-3}kg$

v = speed of coffee filter = 0.8 m/s

Putting values in above equation, we get:

$E=\frac{1}{2}\times 1.2\times 10^{-3}kg\times (0.8m/s)^2\\\\E=3.84\times 10^{-4}J$

As, energy lost by coffee filter = energy gained by air molecules

So, energy lost by coffee filter = Potential energy - Kinetic energy

Energy lost by coffee filter = $(1.176\times 10^{-2})-(3.84\times 10^{-4})=0.011J$

Hence, the energy gained by the air molecules is 0.011 J.

5 0

3 years ago

Briana pushed a 5 kg box of dance flyers with a force of 10 N. What is the acceleration of the box?

maks197457 [2]

Answer:

Explanation:

From force =ma

a=f/m

a=10/5

a=2m/s2

8 0

3 years ago

Read 2 more answers

A runner goes around a 1 mile track if they end up at their starting position what is their dosplacement

mario62 [17]

Answer:

The displacement is zero

Explanation:

Displacement is a vector that connects the starting position of motion of an object to the final position. It is a vector quantity, so it has both magnitude and direction.

Viceversa, distance is a scalar quantity that measures the total length of the path covered by the object during its motion.

In this problem, we are interested in the displacement.

We are told that the runner goes around a 1 mile track, and he ends at his starting position: this means that his final position is equal to the starting position, therefore the displacement is zero.

8 0

3 years ago

A) Using Excel, or some other graphing software, plot the values of y as a function of x. (You will not submit this spreadsheet.

tiny-mole [99]

Answer:

y = 1.06 x + 0.14

r² = 0.95

Explanation:

a) To make this graph, a spreadsheet-type calculation program is used, see attached.

On the y axis are the measured values

On the x-axis, the values checked in the experiment are placed.

From the graph we see that a linear graph and that one of the values has a strong deviation with respect to the others

b) The red line is the best straight line that can be drawn,

for this the quality ajust is r²

the closer to 1 the better the fit

the equation of the line is

y = 1.06 x + 0.14

r² = 0.95

3 0

3 years ago