The Doppler Effect means that all observers of a moving wave source detect the same wave frequency.

1 answer:

6 0

Index fossils (also known as guide
fossils, indicator fossils or zone
fossils) are fossils used to define
and identify geologic periods (or
faunal stages).

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Answer my question please and i will mark you as brainliest i promise

stiks02 [169]

Answer:

From point A to point B there is 15sec and from point C to point D there is 9sec.

Explanation:

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4 years ago

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A scientist at a space research center is doing research on near-Earth objects and determining the kinetic energy of a theoretic

Marysya12 [62]

<span>its kinetic energy is 7350kJ
</span>

Kinetic energy is given as = $\frac{1}{2} mv^{2}$

Now, m = 12 gms = 0.012 kg
And, velocity = 35 kilometers/second = 35000 m/sec

Kinetic energy is given as = $\frac{1}{2} 0.012 kg * 35000*35000 m/[tex] s^{2}$
= 6 $10^{-2}$ ×1225 × $10^{6}$ m/ $s^{2}$
= 7350 kJ

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4 years ago

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If the index of refraction of a medium is 1.4, determine the speed of light in that medium.

Damm [24]

The speed of light in that medium is $2.14 \times 10^8 \ m/s$ .

<u>Explanation:</u>

It is known that the light's speed is constant when it travels in vacuum and the value is $3 \times 108 m/s$ . When the light enters another medium other than vacuum, its speed get decreased as the light gets refracted by an angle.

The amount of refraction can be determined by the index of refraction or refractive index of the medium. The refraction index is measured as the ratios of speed of light in vacuum to that in the medium. It is represented as η = $\frac {c}{v}$

So, here η is the index of refraction of a medium which is given as 1.4, c is the light's speed in vacuum ( $3 \times 10^8 ms^-^1$ ) and v is the light's speed in that medium which we need to find.