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
Lilit [14]
3 years ago
12

A smoke detector is an electronic fire-protection device that automatically senses the presence of smoke as a key indicator of f

ire and creates a loud sound as a warning. In 3-5 sentences, describe what is happening inside a photoelectric smoke detector as soon as smoke enters it
Physics
1 answer:
Colt1911 [192]3 years ago
7 0

Answer:

Photoelectric-type alarms aim a light source into a sensing chamber at an angle away from the sensor. Smoke enters the chamber, reflecting light onto the light sensor; triggering the alarm.

Explanation:

nfpa.org is the website with theanswer

You might be interested in
Which of the following is a good conductor of heat? 1. water 2. glass 3. wood 4. mercury​
trapecia [35]

Answer:

So the answer would be water based on the evidence shown below.

Explanation:

Mercury is a poor conductor of heat but good for electricity, water is a good conductor of heat but a poor conductor of electricity, wood is a poor conductor of heat and electricity, and glass is probably the worst conductor of heat.

7 0
3 years ago
What is the series equivalent of two 1000 W resistors in series?
aleksandrvk [35]
The equivalent resistance when two resistors are connected in series is
the sum of their individual resistances.

The marking on the resistor that says "1000 W" is the rating that tells
how much power the resistor can safely dissipate, without overheating
or exploding. (The 'W' stands for 'Watts'.)  It doesn't tell us anything about
their individual resistances. So we don't have enough information to calculate
their series equivalent.
5 0
3 years ago
Which are characteristics of electromagnetic waves?check all that apply.
emmainna [20.7K]

Correct choices are marked in bold:

travel in straight lines and can bounce off surfaces  --> TRUE, normally electromagnetic waves travel in straight lines, however they can be reflected by objects, bouncing off their surfaces

travel through space at the speed of light  --> TRUE, all electromagnetic waves in space (vacuum) travel at the speed of light, c=3\cdot 10^8 m/s)

travel only through matter  --> FALSE; electromagnetic waves can also travel through vacuum

travel only through space  --> FALSE, electromagnetic waves can also travel through matter

can bend around objects  --> TRUE, this is what happens for instance when diffraction occurs: electromagnetic waves are bended around obstacles or small slits

move by particles bumping into each other  --> FALSE, electromagnetic waves are oscillations of electric and magnetic fields, so no particles are involved

move by the interaction between an electric field and a magnetic field --> TRUE, electromagnetic waves consist of an electric field and a magnetic field oscillating in a direction perpendicular to the direction of motion of the wave

8 0
3 years ago
Read 2 more answers
Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the ch
Softa [21]

Answer:

C. The superposition principle

Explanation:

:)

7 0
3 years ago
Read 2 more answers
What is the gravitational potential energy of a 5 kg box if it is lifted 3 m from the floor?
Murrr4er [49]

Answer:

Its gravitational potential energy is 117.6 joules.

Explanation:

5 0
2 years ago
Other questions:
  • Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object
    10·2 answers
  • One problem with wind energy as a major source of electricity is _____. (1 point)
    8·1 answer
  • A cat weighing 5kg is climbing at the top of a tree and has potential energy at 1176kg. Find the height of the tree
    14·1 answer
  • How do massive stars change the atmosphere?
    13·1 answer
  • A. In what frame of reference does special relativity apply? b. In what frames must general relativity be used? c. Describe what
    15·1 answer
  • What is table salt (NaCl) formed by?
    13·2 answers
  • A flywheel flows from 250rpm to 150rpm in 4.2 seconds. How many revolutions occur during this time ​
    5·1 answer
  • Can someone explain please <br> ???
    10·1 answer
  • Choose the answer that best describes hydrostatic equilibrium.
    11·2 answers
  • nolan ryan has the record for having the speediest fastball in baseball. he could pitch one at 148 i/sec. what is that speed in
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!