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
blondinia [14]
3 years ago
9

What causes resistance in an electric current? how is resistance measured

Physics
1 answer:
steposvetlana [31]3 years ago
4 0
resistance is measured by ohms and when electrons move through a conductor they collide with ions in the material which produces resistance hope this helps
You might be interested in
What is your basal metabolism
Arada [10]
It's the energy your body spends to just keep you breathing and your heart beating ... just being alive, without trying to DO anything.
5 0
3 years ago
Calculate the change in the energy of an electron that moves from the n = 3 level to the n = 2 level. What type of light is emit
marissa [1.9K]

Answer:

Red light

Explanation:

The energy emitted during an electron transition in an atom of hydrogen is given by

E=E_0 (\frac{1}{n_2^2}-\frac{1}{n_1^2})

where

E_0 = 13.6 eV is the energy of the lowest level

n1 and n2 are the numbers corresponding to the two levels

Here we have

n1 = 3

n2 = 2

So the energy of the emitted photon is

E=(13.6) (\frac{1}{2^2}-\frac{1}{3^2})=1.9 eV

Converting into Joules,

E=(1.9 eV)(1.6\cdot 10^{-19} J/eV)=3.0\cdot 10^{-19} J

And now we can find the wavelength of the emitted photon by using the equation

E=\frac{hc}{\lambda}

where h is the Planck constant and c is the speed of light. Solving for \lambda,

\lambda=\frac{hc}{E}=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{3.0\cdot 10^{-19}}=6.63\cdot 10^{-7} m = 663 nm

And this wavelength corresponds to red light.

5 0
3 years ago
Because P and S waves travel faster through the Earth's mantle than through Earth's crust, scientists know that the mantle is __
larisa [96]
B. liquid and less denser
6 0
3 years ago
Read 2 more answers
Ashkon throws a basketball across the court to his teammate. The ball has 57 J of potential energy and 61 J of kinetic energy. W
Gwar [14]
The total mechanical energy of the ball is the sum of its potential energy U and its kinetic energy K, therefore:
E=U+K=57 J+61 J=118 J
so, the total mechanical energy of the basketball is 118 J.
8 0
3 years ago
Read 2 more answers
A cheetah is running 10m/s when it sees its prey & accelerates to 35m/s. The cheetah travels 115m before it stops. What is t
Nesterboy [21]

Answer:

the the the the eeeeeeeeeeeeeeeeeeeeee

Explanation:

4 0
3 years ago
Other questions:
  • A soccer player is running up field at 10 meters per second and comes to a stop in 3 seconds facing the same direction what is h
    11·1 answer
  • Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half way between the two plates th
    11·1 answer
  • Alexander calders mobiles, like untitled, move when air currents move through them, making them_____________
    12·1 answer
  • HEELLPPPP All of the following are major parts of the earth's interior except? core asthenosphere stratosphere mantle
    13·2 answers
  • Consider a basketball player spinning a ball on the tip of a finger. If a player performs 1.91 J1.91 J of work to set the ball s
    9·1 answer
  • A −3.0 nC charge is on the x-axis at x=−9 cm and a +4.0 nC charge is on the x-axis at x=16 cm. At what point or points on the y-
    9·1 answer
  • What is a series circuit? (Definition)
    5·1 answer
  • Which is an example of scientific evidence that can be used to critique a new scientific argument?
    15·1 answer
  • A flat screen is located 0.55 m away from a single slit. Light with a wavelength of 544 nm (in vacuum) shines through the slit a
    7·1 answer
  • Explain why a sound becomes louder as you move closer to the source of the sound.​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!