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Zielflug [23.3K]
3 years ago
15

The ability to clearly see objects at a distance but not close up is properly called ________. The ability to clearly see object

s at a distance but not close up is properly called ________.
Physics
1 answer:
melamori03 [73]3 years ago
5 0

Answer:

Hyperopia

Explanation:

     In hyperopia ,people face difficulties  to see close up object , but can see object easily which are at a distance.

The main reason of hyperopia is our eyeball.When our eyeball become too  short , then light focus behind the retina. Sowe will face problem to see near object but we can see distance object easily. Hyperopia is the opposite of nearsightedness. Hyperopia can be corrected by using contact lenses.

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Which of the following accelerations is the smallest in magnitude (ignore positive or negative signs)?
Basile [38]

The <em><u>gravity on the Earth</u></em> has acceleration is smallest in magnitude

Given:

  • Acceleration from 0 to 30 m/s in 2 s
  • Deceleration from 30 m/s to 10 m/s in 1.5 s
  • Gravity on Earth

To find:

The accelerations with the smallest magnitude

Solution:

  • Acceleration from 0 to 30 m/s in 2 s The acceleration in 2 seconds:

=\frac{30 m/s-0 m/s}{2s}=15 m/s^2

The magnitude of the acceleration is 15.

  • Deceleration from 30 m/s to 10 m/s in 1.5 s The deceleration in 1.5 seconds:

=\frac{10m/s-30 m/s}{1.5 s}=-13.4 m/s^2

The magnitude of the deceleration is 13.4.

  • Gravity on earth

The value of the acceleration due to gravity = g = 9.8 m/s^2

The magnitude of the acceleration is 9.8.

9.8 < 13.4 < 15

The <em><u>gravity on the Earth</u></em> has acceleration is smallest in magnitude.

Learn more about the acceleration here:

brainly.com/question/2437624?referrer=searchResults

brainly.com/question/7488209?referrer=searchResults

5 0
2 years ago
Part A: Determine the wavelength of photons that can be emitted
torisob [31]

Answer:

A  λ = 97.23 nm

, B)   λ = 486.2 nm

, C)  λ = 53326 nm

Explanation:

With that problem let's use the Bohr model equation for the hydrogen atom

          E_{n} = -k e² /2a₀  1/n²

For a transition between two states we have

          E_{nf} -  E_{no} = -k e² /2a₀ (1/  n_{f}² - 1 / n₀²)

Now this energy is given by the Planck equation

         E = h f

And the speed of light is

         c = λ f

Let's replace

      h c / λ = - k e² /2a₀ (1 / n_{f}² - 1 / no₀²)

      1 /  λ = - k e² /2a₀ hc (1 / n_{f}² -1 / n₀²)

Where the constants are the Rydberg constant R_{H} = 1.097 10⁷ m⁻¹

        1 /  λ = R_{H} (1 / n₀² - 1 / nf²)

Now we can substitute the given values

Part A

 Initial state n₀ = 1 to the final state n_{f} = 4

        1 /  λ = 1.097 10⁷ (1/1 - 1/4²)

         1 /  λ = 1.0284 10⁷ m⁻¹

          λ = 9.723 10⁻⁸ m

We reduce to nm

         λ = 9.723 10⁻⁸ m (10⁹ nm / 1m)

         λ = 97.23 nm

Part B

Initial state n₀ = 2 final staten_{f} = 4

       1 /  λ = 1.097 10⁷ (1/2² - 1/4²)

       1 /  λ = 0.2056 10⁻⁷ m

        λ = 486.2 nm

Part C

Initial state n₀ = 3

      1 /  λ = 1,097 10⁷ (1/3² - 1/4²)

       1 /  λ = 5.3326 10⁵ m⁻¹

        λ = 5.3326 10-5 m

        λ = 53326 nm

5 0
3 years ago
A sound-producing object is moving toward an observer. The sound the observer hears will have a frequency ___ that actually bein
Readme [11.4K]
The answer is <span>higher than.
</span><span>A sound-producing object is moving toward an observer. The sound the observer hears will have a frequency higher than that actually being produced by the object.

Why?
</span>As the source of the waves is moving toward the observer, each of the successive wave crest<span> is emitted from a position closer to the observer than the previous wave.
Thus each wave takes slightly less time to reach the observer than the previous wave. So, the time between the arrival of successive wave crests at the observer is reduced, increasing the frequency. </span>
5 0
4 years ago
Read 2 more answers
1.Hold one end of a meter stick down firmly on a table so that 20 centimeters of the meter stick extends past the edge of the ta
andrew-mc [135]
I have done this assignment before so I can tell you the more length that hangs over the table, the less vibration there is due to lack of tension.
6 0
3 years ago
Why does the bottom of a swimming pool always appear shallower than it actually is<br>​
emmainna [20.7K]

Answer:

The refraction of light at the surface of water makes ponds and swimming pools appear shallower than they really are.

Explanation:

so its just the refraction of light at the surface

8 0
3 years ago
Read 2 more answers
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