# help with physics

If we continue heating a piece of initially

room-temperature metal in a dark room,

what will be its first visible color?

1. There will be no color at all.

2. Red

3. Violet

4. White

002 10.0 points

The temperature of your skin is approxi-

mately 37C.

What is the wavelength at which the peak

occurs in the radiation emitted from your

skin?

Answer in units of nm

003 10.0 points

A quantum of electromagnetic radiation has

an energy of 0.83 keV.

What is its frequency? Planck’s constant is

6.63 × 1034 J · s.

Answer in units of Hz

004 10.0 points

An X-ray has a wavelength of 0.0238 nm.

What is the energy of this X-ray? The

speed of light is 2.99792 × 108 m/s and

Planck’s constant is 6.62607 × 1034 J · s.

Answer in units of eV

005 10.0 points

For the following types

radio waves

infared radiation

visible light

ultraviolet radiation

gamma radiation

of electromagnetic radiation, how do the

wavelength, frequency, and photon energy

change as one goes from the top of the list

to the bottom?

Wavelength Frequency Photon Energy

1. Increases Decreases Increases

2. Increases Increases Increases

3. Decreases Decreases Increases

4. Increases Decreases Decreases

5. Decreases Increases Increases

006 10.0 points

In the photoelectric effect, the maximum

speed of the electrons emitted by a metal sur-

face when it is illuminated by light depends

on which of the following?

I) Intensity of the light

II) Frequency of the light

III) Nature of the photoelectric surface

1. I only

2. II and III only

3. III only

4. I, II, and III

5. I and II only

007 10.0 points

The light intensity incident on a metallic sur-

face with a work function of 1.1 eV produces

photoeletrons with a maximum kinetic energy

of 2.65 eV.

If the frequency of the light is doubled,

what is the maximum kinetic energy of the

photoeletrons?

Answer in units of eV

008 10.0 points

The photoelectric effect experiment was sig-

nificant because

1. it showed us how to make an instrument

to detect light by converting photons into

brown (cb42578) – Homework 12 – appartaim – (20541) 2

electrons, ultimately leading to the invention

of the television camera.

2. it demonstrated the existence of quan-

tized states in atoms.

3. it proved that atoms cannot exist if the

rules of classical physics were obeyed on the

atomic scale.

4. it led to the development of the Heisen-

berg Uncertainty Principle, a revolutionary

development that forced us to abandon the

idea of determinacy at the atomic scale and

accept that all we can know are the probabil-

ities of future outcomes.

5. it required us to accept the fact that light

can behave like particles, in contrast to the

teachings of classical physics.

009 (part 1 of 2) 10.0 points

The work function for potassium is 2.24 eV.

If potassium metal is illuminated with light

of wavelength 320 nm, find the maximum

kinetic energy of the photoelectrons. The

speed of light is 3 × 108 m/s and Planck’s

constant is 6.62607 × 1034 J · s .

Answer in units of eV

010 (part 2 of 2) 10.0 points

Find the cutoff wavelength.

Answer in units of nm

011 10.0 points

Calculate the de Broglie wavelength for a pro-

ton moving with a speed of 3.2 × 106 m/s.

The mass of a proton is 1.67262 × 1027 kg

and Planck’s constant is 6.62607 × 1034 J · s.

Answer in units of m

012 10.0 points

At the time of Rutherford’s gold leaf experi-

ment, scientists knew that negatively charged

electrons existed within the atom, but they

did not know where the positive charge

resided.

What information about the positive

charge was provided by Rutherford’s exper-

iment?

1. The positive charge must be concentrated

in a small core (the atomic nucleus).

2. The positive charge can freely move

within the atom.

3. There is no positive charge associated

with an atom.

4. The positive charge is spread throughout

the atom.

013 10.0 points

In the Bohr model of the atom, the postulate

stating that the orbital angular momentum of

the electron is quantized can be interpreted in

which of the following ways?

1. The atom is composed of a small, posi-

tively charged nucleus orbited by electrons.

2. An integral number of electron wave-

lengths must fit into the electron’s circular

orbit.

3. An electron has spin of

1

2

.

4. Only one electron can exist in each possi-

ble electron state.

5. An incident photon is completely ab-

sorbed when it causes an electron to move

to a higher energy state.

014 (part 1 of 6) 10.0 points

A hydrogen atom is in the excited state (n =

3).

Using the Bohr theory of the atom, find

the radius of the orbit. The value of ¯h is

1.05 × 1034 J · s .

Answer in units of nm

015 (part 2 of 6) 10.0 points

Find the linear momentum of the electron.

Coulomb’s constant is 8.99 × 109 N · m2/C2 .

Answer in units of kg · m/

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
• 24/7 support
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
• Expert Proofreading
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

### Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

### Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

error: Content is protected !!