1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
malfutka [58]
3 years ago
6

Suppose you wanted to be able to see astronauts on the moon. What is the smallest diameter of the objective lens required to res

olve a 0.63 m object on the moon? (in m)
Possible choices:


A: 1.94
Physics
1 answer:
LenaWriter [7]3 years ago
5 0

Answer:

A:1.94

Explanation:

cause that the only one on there

You might be interested in
(02.09 MC) An object starts at rest. Its acceleration over 30 seconds is shown in the graph below: An acceleration versus time g
Irina-Kira [14]

Answer:

c. 60 m/s

Explanation:

As you can see in the graph, or the description of the graph, the change in speed since the acceleration at 20 seconds was 0 will be all the acceleration that we added up after that second, since we accelerated at 6 m/s until 30 seconds, that means that the object remained 10 seconds accelerating at 6m/s, so 10seconds times 6 m/s that is 60 m/s in the change in speed between the 20th second and the 30th second.

3 0
3 years ago
Read 2 more answers
An electron is trapped in a one-dimensional infinite well of width 340 pm and is in its ground state. What are the (a) longest,
Nesterboy [21]

Answer:

(a) 1.2703×10⁻⁷ m

(b) 4.7636×10⁻⁸ m

(c) 2.5406×10⁻⁸ m

Explanation:

Given:

Width of the infinite well, L = 340 pm = 340×10⁻¹² m.

The formula for energy of the electron in nth state is:

E_n=\frac {n^2\times h^2}{8mL^2}

The expression for the difference in energy between the levels having quantum numbers n(initial) to n(final) is:

\Delta E_n=\frac {({n_f}^2-{n_i}^2)\times h^2}{8mL^2}

According to Planks theory:

E = hv

where, v is the frequency

Also,

Frequency×Wavelength = Speed of light

So,

E=\frac {hc}{\lambda}

\lambda=\frac {hc}{E}

Also,  using energy from above formula as:

\lambda=\frac {hc}{\frac {({n_f}^2-{n_i}^2)\times h^2}{8mL^2}}

\lambda=\frac {c\times {8mL^2}} {({n_f}^2-{n_i}^2)\times h}}

For longest wavelength ni = 1 and nf = 2

m= mass of the electron = 9.1 ×10⁻³¹kg

c = 3×10⁸m/s

h = 6.625×10⁻³⁴J.sec

\lambda_{Longest}=\frac {3\times 10^8\times {8\times 9.1\times 10^{-31}(340\times 10^{-12})^2}} {({2}^2-{1}^2)\times 6.625\times 10^{-34}}}

<u>Longest wavelength = 1.2703×10⁻⁷ m</u>

For second longest wavelength ni = 1 and nf = 3

\lambda_{Second\ Longest}=\frac {3\times 10^8\times {8\times 9.1\times 10^{-31}(340\times 10^{-12})^2}} {({3}^2-{1}^2)\times 6.625\times 10^{-34}}}

<u>Second longest wavelength = 4.7636×10⁻⁸ m</u>

For third longest wavelength ni = 1 and nf = 4

\lambda_{Third\ Longest}=\frac {3\times 10^8\times {8\times 9.1\times 10^{-31}(340\times 10^{-12})^2}} {({4}^2-{1}^2)\times 6.625\times 10^{-34}}}

<u>Third longest wavelength = 2.5406×10⁻⁸ m</u>

3 0
3 years ago
The density of a fish tank is 0.2fish over feet cubed. There are 8 fish in the tank. What is the volume of the tank?
Verizon [17]

Density is a physical property which describes the mass of a substance per unit of volume of the substance. It is expressed as Density = m / V and it has units like g/cm^3. We use the density given to solve the problem.

<span> Volume of the tank = 8 fishes / 0.2 fish / ft</span><span>³</span>

<span>Volume of the tank = 40 ft</span><span>³</span>

8 0
3 years ago
3. When you graph the motion of an object, you put ____ on the horizontal axis and ____ on the axis.   a.  speed, time   b.  dis
Papessa [141]
The answer is B. distance , Time
7 0
3 years ago
Read 2 more answers
A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam
Fynjy0 [20]

Answer:

The peak value of the electric field is 489.64 V/m

Explanation:

Given;

power of the laser, P = 1.0 mW = 1 x 10⁻³ W

Radius of the beam, R = 1.0 mm = 1 x 10⁻³ m

Area of the beam = πr² = π(1 x 10⁻³ )² = 3.142 x 10⁻⁶ m²

The average intensity of the light = P / A

The average intensity of the light = ( 1 x 10⁻³) / (3.142 x 10⁻⁶)

The average intensity of the light = 318.27 W/m²

The peak value of the electric field is given by;

E_o = \sqrt{\frac{2I_{avg}}{c\epsilon_o}}\\\\E_o = \sqrt{\frac{2(318.27)}{(3*10^8)(8.85*10^{-12})}}\\\\E_o = 489.64 \ V/m

Therefore, the peak value of the electric field is 489.64 V/m.

4 0
3 years ago
Other questions:
  • When astronomers observe the spectra of distant galaxies,they notice that the hydrogen emission lines are shifted noticeably tow
    8·1 answer
  • A 36,287 kg truck has a momentum of 907,175 kg • . What is the truck’s velocity
    15·2 answers
  • When the wood block is dropped in the water and settles so that it floats and is no longer bobbing up and down, how do the buoya
    14·1 answer
  • The electric field in a region of space has the components Ey = Ez = 0 and Ex = (4.00 N/C · m) x. Point A is on the y axis at y
    12·1 answer
  • A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration in meters per seco
    12·1 answer
  • A comet is cruising through the Solar System at a speed of 50,000 kilometers per hour for 4.5 hours time. What is the total dist
    9·1 answer
  • I have a 3 cc piece of aluminum with a density of steel with a mass of 24.0 g. I cut it into 2 equal pieces. How has the density
    13·1 answer
  • PLEASE HELP ME CORRECT ANSWERS ONLY​
    6·1 answer
  • According to one of the laws of thermodynamics, energy cannot be what?
    9·1 answer
  • Explain how horizontal motion can be uniform while vertical motion is accelerated.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!