3 years ago

Carbon and silicon are found in the earth's crust and in what type of bonds?

Physics

1 answer:

denis23 [38]3 years ago

5 0

Trans metals and other non metals

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Which unit of heat was originally defined in terms of the Fahrenheit temperature scale, not the Celsius scale?

Kitty [74]

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I think the answer would be British Thermal Unit

Explanation:

It equals one degree Fahrenheit and the equation for it is 1.055 × 103 joules.

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7.9x10^9 km is equal to?

Georgia [21]

Explanation:

7.9x10^9 km is equal to

=7900000000km

Please mark it as brainliast

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Friction marks are made by tools that indent a surface. True or false

k0ka [10]

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The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash

Reil [10]

Answer:

$3.3\cdot 10^{15}$

Explanation:

First of all, let's calculate the energy of a single photon of wavelength

$\lambda=550 nm=5.5\cdot 10^{-7}m$

which is given by

$E_1 = \frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{5.5\cdot 10^{-7} m}=3.6\cdot 10^{-19} J$

The power of the flash is

$P=1.2 mW=0.0012 W$

and the time it lasts is

$t=100 ms=0.1 s$

so the total energy delivered in one flash is

$E=Pt=(0.0012 W)(0.1 s)=1.2\cdot 10^{-3}J$

This energy contains exactly N photons each of energy $E_1$ , so the number of photons emitted in one flash is

$N=\frac{E}{E_1}=\frac{1.2\cdot 10^{-3} W}{3.6\cdot 10^{-19}J}=3.3\cdot 10^{15}$

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Question 4 of 10

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Answer:

Normative

Explanation:

It is normal occurance but not unnatural

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