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
Elena-2011 [213]
3 years ago
14

How many photons are emitted per second by a He−Ne laser that emits 1.5 mW of power at a wavelength λ=632.8nm. What is the frequ

ency of the electromagnetic waves emitted by a He−Ne laser?
Physics
1 answer:
son4ous [18]3 years ago
3 0

Answer:

The frequency of the emitted EM wave by He-Ne laser is 4.74\times 10^{14} Hz

Given:

Power emitted by He-Ne laser, P = 1.5 mW = 1.5\times 10^{- 3}

Wavelength, \lambda = 632.8 nm = 632.8\times 10^{- 9} m

Solution:

Now, to calculate the frequency, \vartheta of the EM wave emitted:

Energy associated with 1 photon = Power of one photon per sec = \frac{hc}{\lambda}

Therefore, power associated with 'N' no. of photons, P = N\frac{hc}{\lambda}

where

h = 6.626\times 10^{-34} m^{2}kg/s = Planck's constant

Now,

1.5\times 10^{- 3} = N\frac{6.626\times 10^{-34}\times 3\times 10^{8})}{632.8\times 10^{- 9}}

N = 4.77\times 10^{15}

Also, we know that:

c = \vartheta \lambda

Thus

\vartheta = \frac{c}{\lambda} = \frac{3\times 10^{8}}{632.8\times 10^{- 9}}

\vartheta = 4.74\times 10^{14} Hz

You might be interested in
Desde lo alto de un acantilado de 140 m, se lanza verticalmente un objeto hacia abajo con velocidad de 3m/s. Entonces la magnitu
grin007 [14]

Answer:

54

Explanation:

d = vo*t + ½*g*t²

d = 3*3 + ½*10*3²

d = 9 + 45

d = 54 m

entonces el objeto tiene 54 m de desplazamiento

7 0
3 years ago
_____ is the frictional force needed to slow an object in motion
s2008m [1.1K]

Answer:

<u>Drag force</u> is the frictional force needed to slow an object in motion

Explanation:

8 0
3 years ago
Read 2 more answers
Which is the best example of potential energy?
svetoff [14.1K]
First one, holding a basketball in the air. Potential energy is the energy it has mostly from gravity. The further you go from the center of mass, the more energy.
8 0
3 years ago
Read 2 more answers
What two energies does a bulldozer use​
sesenic [268]
Mechanical and electrical
3 0
2 years ago
Plz help on number 4
ki77a [65]
Forces on a Baseball. When a baseballis thrown or hit, the resulting motion of the ball is determined by Newton's laws of motion. ... Lift and drag are actually two components of a single aerodynamic force acting on the ball. Drag acts in a direction opposite to the motion, and lift acts perpendicular to the motion.
8 0
3 years ago
Other questions:
  • How does the electrical force relate to the charge of an object?
    11·2 answers
  • A car traveling at 40 ft/sec decelerates at a constant 5 feet per second per second. how many feet does the car travel before co
    15·1 answer
  • when an incandescent light bulb is turned on, its thin wire filament heats up quickly. as the temperature of this wire filament
    12·1 answer
  • Wonder Woman and Superman fly to an altitude of 1690 km , carrying between them a chest full of jewels that they intend to put i
    10·1 answer
  • Johannes Kepler started his astronomy career as an assistant to??
    9·1 answer
  • Oxygen enters the blood through the.... I do not know the answer. Can someone please help me?!?!
    5·2 answers
  • Projectile Motion: A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when
    13·1 answer
  • a jetliner goes from rest to a takeoff speed of 162 mi/h in 39.5 s. what is the magnitude of its average acceleration?
    10·1 answer
  • Red light Green light is used to work on what skill?
    7·2 answers
  • Please help me out i'm so depressed and such a failure
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!