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
Dominik [7]
3 years ago
8

The energy efficiency of an incandescent light bulb (= the percentage of consumed power that is actually converted into radiated

light) is typically around 5%. Suppose a certain brand of 75 W incandescent bulb emits light primarily at wavelength ???? = 570 nm.
Calculate the total number of photons emitted by one of those bulbs if it has been shining for a 6-hour period.
Physics
1 answer:
Hitman42 [59]3 years ago
3 0

Answer:

4*10^22 photons

Explanation:

To find the number of photons is necessary to calculate the total energy of the light emitted in one hour = 3600s:

E'=0.05E=0.05Pt=0.05(75J/s)(3600s)=13.500J

Furthermore, is necessary to find the  associated energy to the photon 0f 570nm with following formula:

E'=h\nu=h\frac{c}{\lambda}

h: Planck's constant = 6.62*10^-34 Js

c: speed of light = 3*10^8 m/s

wavelength = 570*10^-9 m

E_p=(6.62*10^{-34}Js)\frac{3*10^{8}m/s}{570*10^{-9}m}=3.484*20^{-29}J

Finally you divide E' between Ep to find the number of photons:

n=\frac{E'}{E_p}=\frac{13.500J}{3.484*10^{-19}}\approx4*10^{22}photons

the number of emitted photons is 4*10^22

You might be interested in
A crate is pushed up each of the two ramps shown in the diagram below. Based on the concept that simple machines make work easie
Naddik [55]

Answer:

ramp b requires less force than ramp a

Explanation:

7 0
3 years ago
A table exerts a 4.0 Newton force on a book which lies at rest on its top. The force exerted by the book on the table is
SOVA2 [1]
I believe the correct answer from the choices listed above is the third option. <span>The force exerted by the book on the table is equal to the force exerted by the table which is 4.0 N. The book does not move so it must be that the forces are balanced. Hope this answers the question.</span>
4 0
3 years ago
Read 2 more answers
How does a television have a negative effect on the environment
max2010maxim [7]

Answer:

Too much screen time can be a bad thing: Children who consistently spend more than 4 hours per day watching TV are more likely to be overweight. Kids who view violent acts on TV are more likely to show aggressive behavior, and to fear that the world is scary and that something bad will happen to them. When we considered the whole television chain of production, distribution and consumption, we found that the largest environmental impact associated with a television programme was not the energy consumed in making it, but the energy used by the millions of televisions, set-top boxes and other consumer devices involved

Explanation:

8 0
3 years ago
What is Aeronautical Science?
MissTica

Answer:

Aeronautical science is the science of flight, and this field relates to careers involved with the design and development of aircraft. Aeronautical engineers study how flight may be achieved within the earth's atmosphere and use that knowledge to pilot or design airplanes.

Explanation:

4 0
3 years ago
When light passes into a more dense material, it bends away from the
asambeis [7]

Answer: true

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following describes the charge of an atom before any electrons are transferred?
    13·1 answer
  • Two identical soccer balls are rolled towards each other. What will be true after they collide head-on
    12·2 answers
  • In a population of seals, most of the seals have similar coloring. However, one seal has albinism. This seal is white and is alm
    13·2 answers
  • 50 points!
    14·1 answer
  • In equilibrium, ________. Group of answer choices the ratio of marginal benefits to income should be identical across all goods
    10·1 answer
  • 100 POINTS. PLEASE PROVIDE EXPLANATION
    5·1 answer
  • A car travels 8km in 7 minutes. Find the speed of the car.
    13·1 answer
  • Why does the friction force stay the same when the applied force is increasing?
    5·1 answer
  • Quick an answer correct answer!<br><br><br><br> ----------------
    13·1 answer
  • A camper stands in a valley between two parallel cliff walls. He claps his hands and notices that the echo from the nearby wall
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!