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ycow [4]
4 years ago
14

How many protons are in the radioactive isotope 40/19K?

Physics
1 answer:
trasher [3.6K]4 years ago
8 0
First we have to establish that the number of protons is equivalent to the atomic number of element. Here I am assuming that you are referring to Potassium (K) - 40. Potassium, stable or unstable has 19 protons.
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Come up with an example of classical conditioning in your own life or in the real world. Be sure to identify the unconditioned s
mote1985 [20]

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4 0
3 years ago
Objects that absorb shorter wavelengths of light are perceived as ______, those that absorb longer wavelengths are perceived as
miss Akunina [59]

According to the visible spectrum, we can deduce the following:

  1. Objects that absorb shorter wavelengths of light are perceived as <u>red</u>.
  2. Objects that absorb longer wavelengths are perceived as <u>blue</u>.
  3. Objects that reflect all wavelengths are perceived as <u>white</u>.
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<h3>What is light?</h3>

Light can be defined as a form of electromagnetic waves (radiation) that do not require any medium for its propagation. Thus, light is generally referred to as a visual signal because it can be seen with the eyes.

<h3>The wavelength of light.</h3>

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According to the visible spectrum, we can deduce the following:

  1. Objects that absorb shorter wavelengths of light are perceived as <u>red</u>.
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Read more on wavelength here: brainly.com/question/25699025

4 0
2 years ago
(please show work)
Helga [31]

c. -98 m/s

The motion of the rock is a uniformly accelerated motion (free fall) with constant acceleration g=-9.8 m/s^2 (negative since it is downward). Therefore, we  can find its velocity using the following suvat equation

v=u+gt

where

v is the final velocity

u is the initial velocity

g is the acceleration of gravity

t is the time

For the rock in the problem,

u = 0

So, its velocity at t = 10 s is

v=0+(-9.8)(10)=-98 m/s

where the negative sign indicates that the velocity points downward.

d. -490 m

Since the motion is at constant acceleration, we can use another suvat equation:

s=ut+\frac{1}{2}gt^2

where

s is the displacement

u is the initial velocity

g is the acceleration of gravity

t is the time

Substituting:

u = 0

g=-9.8 m/s^2

t = 10 s

We find the rock's displacement:

s=0+\frac{1}{2}(-9.8)(10)^2=-490 m

where the negative sign means the displacement is downward.

5 0
4 years ago
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avanturin [10]
Light waves a) do not require a medium
6 0
3 years ago
Read 2 more answers
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tamaranim1 [39]

Answer:

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Explanation:

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