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3 years ago

5

Which statement about a wave produced by a doorbell is true?

1 answer:

vfiekz [6]3 years ago

3 0

"It propagates in the form of compression and rarefactions" is the one statement among the following choices given in the question that is true about a <span>wave produced by a doorbell. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer helps you. </span>

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How many total oxygen atoms are in the compound Molybdenum (V) Dichromate?

alekssr [168]

Answer:

$1.2646\times10^{25}\ atoms$

Explanation:

-The chemical formula for Molybdenum (V) Dichromate is $Mo(Cr_2O_7)_3$

-There are 21 moles of oxygen per one mole of Molybdenum (V) Dichromate

-We apply Avogadro's constant to find the number of atoms of oxygen:

$Avogadro's \ Constant=6.022\times 10^{23} \ mol_1\\\\No\ of \ Atoms=Moles\times Avogadro's \ Constant\\\\=21\times 6.022\times 10^{23} \\\\=1.2646\times10^{25}\ atoms$

Hence, there are $1.2646\times10^{25} \ atoms$

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3 years ago

WILL GIVE BRAINLIST: Does an objects weight affect how fast it falls?

maw [93]

Answer:

it's depent on height and gravity

5 0

3 years ago

It's time for Santa to deliver his presents. Assuming he delivers presents all over the world, he has to travel about 75,000,000

algol13

2,419,354.8387960000

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3 years ago

The diameter of the moon is a little less than the distance across the United States. Please select the best answer from the cho

dlinn [17]

Answer:

true

Explanation:

The diameter of the Moon is 3474 km. The distance across the United States, from Florida to Washington, is 4509.382 km.

6 0

3 years ago

Read 2 more answers

A 0.49 m copper rod with a mass of 0.15 kg carries a current of 13 A in the positive y direction. Let upward be the positive dir

Helen [10]

Answer:

Magnetic field, B = 0.23 T

Explanation:

Given that,

Length of the copper rod, L = 0.49 m

Mass of the copper rod, m = 0.15 kg

Current in rod, I = 13 A (in +ve y direction)

When the rod is placed in magnetic field, the magnetic force is balanced by its weight such that :

$BIL=mg\\\\B=\dfrac{mg}{IL}\\\\B=\dfrac{0.15\times 9.8}{13\times 0.49}\\\\B=0.23\ T$

So, the magnitude of the minimum magnetic field needed to levitate the rod is 0.23 T.

6 0

3 years ago