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3 years ago

How much energy in kJ is associated with a radio wave of wavelength 1.2 X 10^2 m?

1 answer:

eduard3 years ago

6 0

It's very simple.

Energy = $\frac{hc}{\lambda}$

where, h= Planck's constant = 6.6 x $10^{-34}$ $m^2 kg/s$

c= speed of light = 3 x $10^{8}$ m/s
$\lambda$ = wavelength

So, energy = $\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{120}$

= 1.65 x $10^{-27}$ J
=1.65 x $10^{-30}$ KJ

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How many carbon atoms are there in a 1.5-carat diamond? diamonds are a form of pure carbon. ( 1 carat=0.20 grams)?

11111nata11111 [884]

1 carot = 0.2 grams
1.5 carot = 0.3 grams.

1 mol of Carbon = 12 grams
x mol = 0.3 grams

0.3 * 1 = 12 x
x = 0.3/12
x = 0.025 mol

1 mol of Carbon is 6.02 * 10^23 atoms
0.025 mol of carbon is x

1/0.025 = 6.02*10^23 * /x
x = 0.025 * 6.02 * 10^23
x = 1.5 * 10^22 atoms of carbon.

5 0

2 years ago

Silver was precipitated and collected by filtration. The experiment yielded .077g of silver after dying. The predicted yield was

PSYCHO15rus [73]

Answer:

Precentage error = 7.23%

Explanation:

The precentage error formula is the useful method for determining precision of your experimental result

It can be calculated using :

$percent\ error = |\frac{experimental\ value-predicted\ value} {predicted\ value}|\times 100$

$percent\ error = |\frac{0.077\ -0.083} {0.083}|\times 100$

So we get percentage error = 7.23%

Precision means how close the experimental value to the true value or theoretical value

If percentage error is large it means experimental results are deviated and there is need to check mistakes,imprecision in the experiment

If the percentage error is zero it means the experiment is perfectly done without inaccuracy

4 0

2 years ago

Plz help!!!

baherus [9]

a) The change here is that metallic iron is converted into ions and copper is deposited. This is called a displacement reaction.

b) $\text{Fe}$ is oxidised in this reaction.

c)$ \mathrm{Fe_{(s)}+ CuSO_{4(aq)} \rightarrow FeSO_{4(aq)} + Cu_{(s)}}$

7 0

3 years ago

An element has two isotopes, A and B, with mass numbers of 32.0 and 33.0 respectively. The relative atomic mass is 32.3. The per

vlada-n [284]

Answer:

d) A - 70% B - 30%

Explanation:

If x is the abundance of A, and 1−x is the abundance of B, then:

x (32.0) + (1−x) (33.0) = 32.3

32x + 33 − 33x = 32.3

33 − x = 32.3

x = 0.7

The abundance of A is 70%, and the abundance of B is 30%.

7 0

3 years ago

Read 2 more answers

Problems that I am stuck on! Need the answers asap

Anna71 [15]

Answer:

1.b

2.b

3.a

4.a

Explanation:

use the rate laws when answering this.

6 0

1 year ago