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4 years ago

Is a compound a pure substance? Why or why not

Physics

2 answers:

salantis [7]4 years ago

6 0

No a compound is made up of 2 or more substances, a pure substance is an element

Cloud [144]4 years ago

3 0

Answer:

No a compound has 2 or more pure substances.

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About 0.1 eV is required to break a "hydrogen bond" in a protein molecule. Calculate the minimum frequency and maximum wavelengt

Verdich [7]

Answer:

$2.41\cdot 10^{13}Hz, 1.24\cdot 10^{-5}m$

Explanation:

The energy of the photon must be equal to 0.1 eV, so let's convert this value into Joules first:

$E=0.1 eV \cdot 1.6\cdot 10^{-19} J=1.6\cdot 10^{-20}J$

The energy of the photon is related to its frequency by

$E=hf$

where h is the Planck constant and f is the frequency. Substituting,

$f=\frac{E}{h}=\frac{1.6\cdot 10^{-20}J}{6.63\cdot 10^{-34}Js}=2.41\cdot 10^{13}Hz$

And now we can find the wavelength of the photon, which is given by

$\lambda=\frac{c}{f}$

where c is the speed of light. Substituting,

$\lambda=\frac{3\cdot 10^8 m/s}{2.41\cdot 10^{13} Hz}=1.24\cdot 10^{-5}m$

8 0

3 years ago

An ideal parallel-plate capacitor having circular plates of diameter D that are a distance d apart stores energy U when it is co

Stella [2.4K]

Answer: $\sqrt{3}D$

Explanation:

Given

Diameter of Plates is D

distance between Plates is d

Energy Stored in the Plates is U

Suppose fixed Potential is V

Energy is given by

$U=\frac{1}{2}CV^2$

where C=capacitance

$C=\frac{\epsilon A}{d}$

where A=area of Plates

$A=\frac{\pi D^2}{4}$

Thus $C=\frac{\epsilon \cdot \pi \cdot D^2}{4d}$

Keeping all other factors as same

$U\propto D^2----1$

For triple the Energy

$3U\propto (D')^2-----2$

divide 1 and 2 we get

$\frac{U}{3U}=\frac{D^2}{D'^2}$

$D'=\sqrt{3}D$

Thus the diameter should be change to $\sqrt{3}$ times of original value

3 0

3 years ago

A large mass collides with a stationary, smaller mass. How will the masses behave if the collision is inelastic?

Mamont248 [21]

Most likely they would stick together and keep moving together

7 0

3 years ago

Read 2 more answers

What are some problems associated with the introduction of an exotic species into an ecosystem?

vodomira [7]

People in public getting killed

5 0

4 years ago

Read 2 more answers

Measure the width of a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper. Make the measurement in centimeters

laiz [17]

Answer: width = 27.94 cm

Explanation:

Given a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper.

From the value given, the width is 11.0 inches

To make the measurement in centimeters, we will convert inches into centimeters.

1 inche = 2.54 centimeters

That is, 11 × 2.54 centimeters = 27.94 cm.

Therefore, the width is 27.94 cm.

3 0

4 years ago