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3 years ago

Lunar Eclipe's do not happen every month because the moon, earth and sun must be lined up in a certain way.

Chemistry

2 answers:

chubhunter [2.5K]3 years ago

5 0

True

Thank you for you time

Andreyy893 years ago

4 0

Answer:

A. True

Explanation:

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Serhud [2]

Explanation:

Given that,

The frequency of electromagnetic spectrum is $2.73\times 10^{16}\ Hz$

(A) Let the wavelength of this radiation is $\lambda$ . We know that,

$c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{2.73\times 10^{16}}\\\\\lambda=1.09\times 10^{-8}\ m$

So, the wavelength of this radiation is $1.09\times 10^{-8}\ m$ .

(B) Let E is the energy associated with this radiation. Energy of an electromagnetic radiation is given by :

$E=hf$

h is Planck's constant

$E=6.63\times 10^{-34}\times 2.73\times 10^{16}\\\\E=1.8\times 10^{-17}\ J$

1 kcal = 4184 J

It means,

$1.8\times 10^{-17}\ J=\dfrac{1}{4184}\times 1.8\times 10^{-17}\\\\=4.3\times 10^{-21}\ \text{kcal}$

Hence, this is the required solution.

3 0

3 years ago

Which mineral would most likely be found in a necklace? graphite, halite, sulfur, or emerald?

dusya [7]

Answer:

D is the answer because I think it is right plus I know they don't use two off them

5 0

3 years ago

Read 2 more answers

Two factors that determine kinetic energy are

Anna11 [10]

Your answer is mass and speed! Please give me brainlist :)

4 0

3 years ago

Read 2 more answers

If 2 objects have the same density they must have the same

atroni [7]

Answer:

Explanation:

Density can be defined as mass divided by volume. But 2 objects made of the same material will have the same density regardless of their volume.

8 0

3 years ago

Balance in basic solution: O2(g) + Cr³+ (aq) → H₂O2 (1) + Cr₂O7²- (aq)

likoan [24]

cr2o72+H2o2-(r3+o2)

Explanation:

r62o72+H2o2-(r3+o2)

3 0

3 years ago