3 years ago

What makes a substance, such as aluminum, a good conductor?

1 answer:

8 0

Answer:

For a material to be a good conductor, the electricity passed through it must be able to move the electrons; the more free electrons in a metal, the greater its conductivity.

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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

What is the mass of a book that weighs 234 N?

rosijanka [135]

Answer:

23.86136

Explanation:

3 0

3 years ago

As more resistors are added in series across a constant voltage source, the power supplied by the source: A) does not change. B)

Anon25 [30]

As series resistors are added, the resistance is added directly so the total resistance will be equal to

$R_T = R_1+R_2+R_3... R_{\infty}$

Since the power is determined as

$P = \frac{V^2}{R}$

We have there that

$P \propto \frac{1}{R}$

The power is inversely proportional to the increase in resistance, so it will tend to decrease as more resistors are added in series.

The correct answer is: C.

4 0

3 years ago

True or false A radioactive isotope that can be followed through the steps of a chemical reaction is an indicator.

ozzi

Hi, your answer is false.

I hoped I helped and if you need more you could always ask me :)

-Dawn

6 0

3 years ago

A car has a force of 2000N and a mass of<br> 1000kg. What is the acceleration of the<br> car?

yan [13]

Answer:

100

Explanation:

by dividing 2000N and 1000kg.

5 0

4 years ago