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
pav-90 [236]
3 years ago
8

Only a fraction of the electrical energy supplied to a tungsten light bulb is converted to visible light. The rest of the energy

shows up as infrared radiation (i.e., heat). A 75-W light bulb converts 15.0% of the energy supplied to it into visible light. Assuming a wavelength of 550 nm, how many photons are emitted by the light bulb per second? (recall 1 W = 1 J/s)
Physics
1 answer:
Deffense [45]3 years ago
7 0

Answer:

n=3.11\times 10^{19}\ photons\ per\ second

Explanation:

It is given that,

Power of the light bulb, P = 75 W

Wavelength, \lambda=550\ nm=550\times 10^{-9}\ m

It is mentioned that light bulb converts 15.0% of the energy supplied to it into visible light. 15 % of 75 W is,

E=15\%\ of \ 75\ W=11.25\ J

Let n is the number of photons emitted by the light bulb per second. It is given by :

E=\dfrac{nhc}{\lambda}

n=\dfrac{E\lambda}{hc}

n=\dfrac{11.25\times 550\times 10^{-9}}{6.63\times 10^{-34}\times 3\times 10^8}

n=3.11\times 10^{19}\ photons\ per\ second

Hence, this is the required solution.

You might be interested in
A circuit has a resistance of 2.5 Ω and is powered by a 12.0 V battery.
Marizza181 [45]

Just apply Ohm's Law:


I=V/R=12/2.5=4.8A

5 0
2 years ago
What is the length of a pendulum that has a period of 0.500s?
anyanavicka [17]
That is the answer to your problem

7 0
3 years ago
Diagram B D c с Which car has: Ke = 100 PE=0? * 1 point A B C D​
erma4kov [3.2K]

Answer:

The car C has KE = 100, PE = 0

Explanation:

The principle of conservation of energy states that although energy can be transformed from one form to another, the total energy of the given system remains unchanged.

The energy that a body possesses due to its motion or position is known as mechanical energy. There are two kinds of mechanical energy: kinetic energy, KE and potential energy, PE.

Kinetic energy is the energy that a body possesses due to its motion.

Potential energy is the energy a body possesses due to its position.

From the principle of conservation of energy, kinetic energy can be transformed into potential energy and vice versa, but in all cases the energy is conserved or constant.

In the diagram above, the cars at various positions of rest or motion are transforming the various forms of mechanical energy, but the total energy is conserved at every point. At the point A, energy is all potential, at B, it is partly potential partly kinetic energy, However, at the point C, all the potential energy has been converted to kinetic energy. At D, some of the kinetic energy has been converted to potential energy as the car climbs up the hill.

Therefore, the car C has KE = 100, PE = 0

6 0
3 years ago
What is the current in a 160V circuit if the resistance is 20Ω
Mkey [24]

Answer:

I =V/R

I= 160/20 = 8 Amperes

3 0
3 years ago
Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. Use each word only o
Vlad [161]

Answer:

1. About a trillion comets are thought to be located far, far beyond Pluto in the Oort cloud.

2. The bright spherical part of a comet observed when it is close to the Sun is the coma .

3. A comet's plasma tail stretches directly away from the Sun.

4. A comet's nucleus is the frozen portion of a comet.

5. Particles ejected from a comet can cause a(n) meteor shower on Earth.

6. The Kuiper belt extends from about beyond the orbit of Neptune to about twice the distance of Neptune from the Sun.  

Explanation:

1. Oort cloud is a theoretical cloud of icy objects in interstellar space. Its inner limit begins about 2000-5000 AU from sun outer limit (about 100000-200000 AU) defines the boundary of solar system.  

Note: AU is the astronomical unit which is defined as the distance between the Sun and Earth.  

2. Comets are described as “dirty snowballs” which is a mixture of frozen gases and dust. When this snowball gets closer to the Sun, gas evaporates, and a fuzzy haze of gas and dust emerges. This fuzzy tail is the coma.

3. Dust and gas in the coma interact with the sunlight and the solar wind. Charged particles in the coma are caught up in the magnetic field of sun and flow away from the sun.  

4. Nucleus is the dirty snowball which consists of rock, dust and frozen gas.  

5. Meteor shower is a celestial event with number of meteors can be observed. Meteors are meteoroids that enters earth’s atmosphere with extremely high speeds.

6. Kuiper belt is a region beyond Neptune including dwarf planets and icy objects.  

5 0
3 years ago
Other questions:
  • A very thin 19.0 cm copper bar is aligned horizontally along the east-west direction. If it moves horizontally from south to nor
    8·1 answer
  • Consider two identical springs. At the start of an experiment, Spring A is already stretched out 3 cm, while Spring B remains at
    12·1 answer
  • The gravity between me (68 kg) and my laptop (0.91 kg)
    8·1 answer
  • A kilometer is a measure of an object’s
    13·1 answer
  • Based on the information in the graph which region is expected to have the least population growth from 2000 to 2020
    9·1 answer
  • 112. A string, fixed on both ends, is 5.00 m long and has a mass of 0.15 kg. The tension if the string is 90 N. The string is vi
    13·1 answer
  • What measurement do geologists use to find absolute age
    9·2 answers
  • A 50Kg girl jumps off a 5-meter-high diving board. What is her kinetic energy right before she hits the water?
    8·1 answer
  • Notación científica de 55,000m
    5·2 answers
  • One Affective way to develop the feeling function in one’s personality is to
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!