A laser pulse of duration 25 ms has a total energy of 1.4 J. The wavelength of this radiation is
567 nm. How many photons are emitted in one pulse? Let 1 eV = 1.60 x 10-19 J, the mass of
an electron m=9.11 10-31
kg, the speed of light c= 3.00 x 108 m/s, and Planck's constant h
= 4.136 10-15 eV .s.

Answers

Answer 1

Answer:

n = 4 x 10¹⁸ photons

Explanation:

First, we will calculate the energy of one photon in the radiation:

[tex]E = \frac{hc}{\lambda}\\\\[/tex]

where,

E = Energy of one photon = ?

h = Plank's Constant = 6.625 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength of radiation = 567 nm = 5.67 x 10⁻⁷ m

Therefore,

[tex]E = \frac{(6.625\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{5.67\ x\ 10^{-7}\ m}[/tex]

E = 3.505 x 10⁻¹⁹ J

Now, the number of photons to make up the total energy can be calculated as follows:

[tex]Total\ Energy = nE\\1.4\ J = n(3.505\ x\ 10^{-19}\ J)\\n = \frac{1.4\ J}{3.505\ x\ 10^{-19}\ J}\\[/tex]

n = 4 x 10¹⁸ photons


Related Questions

The starting temperature of a beaker of water is 60 F. The thermometer shows the temperature of the same beaker of water after being heated on a hot plate. How much higher is the temperature after the water is heated? Record your answer below.

Answers

Answer:

The temperature after the water is heated is higher by 152°F

Explanation:

The starting  temperature of a beaker of water = 60 F

Temperature of water in heated condition = 212°F

The temperature rises by 212°F - 60°F =  152°F

The temperature after the water is heated is higher by 152°F

I have no questions.

Answers

Answer: happy Ramadan

Explanation: thanks

how much kinetic energy does an 8 kg bowling ball have when it is thrown 9 m/s. down the alley

Answers

Answer:

324 J

Explanation:

KE= 1/2 m*v^2

1/2*8*9^2

324 joules (=^w^=) woof woof

what happens to the mechanical energy of an apple as it falls from a tree?

Answers

Answer:

When the apple falls from the tree, it has some gravitational potential energy due to its height. Now, When it starts falling, the Gravitation Potential energy will starts converting into the Kinetic Energy. When the apple is about to strikes the ground, the Gravitational Potential energy have been converted into the Kinetic Energy.

Explanation:

The potential energy will be low when its kinetic energy is high and vice versa. But the mechanical energy remains conserved.

What is mechanical energy?

Mechanical energy can be explained as the sum of kinetic energy and potential energy that can be used to do work. Mechanical energy can be described as the energy of a body due to its motion or position.

The total mechanical energy of a physical system is conserved as the energy can not be created or destroyed. The mechanical energy of a physical system can only be transformed from one form to another when the forces acting work are conservative in nature.

Each force is related to potential energy form and the energy changes between different kinds of potential energy and kinetic energy but the total energy remains constant.

The mechanical energy of the apple remains conserved. As the apple falls its potential energy is converted into kinetic energy.

Learn more about mechanical energy, here:

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You drive a car for 2.0 h at 60 km/h, then for another 3.0 h at 85 km/h. What is your average velocity

Answers

Answer:

Explanation:

Average velocity is found in the total displacement experienced in the trip divided by the total time it took to make this trip. If, for the first 2.0 hours, the car travels at 60 km/hr, then in 2.0 hours the car can travel 120 km; if it then travels for 3.0 at 85 km/hr, it can travel 255 km in the same direction. The total time this took was 5.0 hours. So doing the math and rounding correctly by following the rules for the adding and subtracting of sig fig's:

[tex]v=\frac{120+255}{5.0}=\frac{380}{5.0}=76\frac{km}{hr}[/tex]

If you do not round when you add, the average velocity is 75 km/hr

what is scalar quantity​

Answers

Scalar quantities have a size or magnitude only and need no other information to specify them.
Hope this helps!

On a cold day, the speed of sound in air is 330 m/s. A note with a frequency of 1,320 Hz is played on an instrument. What is the wavelength of that sound wave? 0.25 m 4 m 1,650 m 435,600 m

Answers

Answer:

0.25 m

Explanation:

Given that,

The speed of sound, v = 330 m/s

The frequency of the note of the instrument, f = 1320 Hz

We need to find the wavelength of the sound wave.

We know that,

Wavelength, [tex]\lambda=\dfrac{v}{f}[/tex]

Put all the values,

[tex]\lambda=\dfrac{330}{1320}\\\\\lambda=0.25\ m[/tex]

So, the wavelength of the sound wave is equal to 0.25 m.

Answer: .25m edge 2020

Explanation:

GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 20pts-

Answers

Answer:

B

Explanation:

inside of a balloon is gas so it has room to move freely

if i ask wat r the application of simple machine some of u will say-----> Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever. While simple machines may magnify or reduce the forces that can be applied to them, they do not change the total amount of work needed to perform the overall task.
but actually the application of simple machine is
i) they transfer force from one point to another
ii) They accelerate the rate of doing work
iii) the multiply force

Answers

Answer:

DID NOT

UNDER STAND

Explan it a littlebit

A box is accelerated from rest along a frictionless surface by a net force of 100N. It covers 40 metres in 5 seconds. Find the mass of the box.

Answers

Answer: 31,25

Explanation:

F=  100

[tex]F=ma[/tex]

a=?

x = 40

Vo = 0

We have to evaluate a :

[tex]x = Vot + \frac{1}{2}at^2\\\\40=0+\frac{1}{2}a(5^2 )\\\\80=25a\\\\3,2=a[/tex]

The force formula :

[tex]F=ma[/tex]

[tex]100=m*3,2\\\\31,25=m[/tex]

Which event occurs during high tide?

All of Earth’s ocean levels rise.
The moon’s orbit is closer to Earth.
The gravity of the Sun and moon cause the Earth’s crust and water to bulge.
Earth’s crust and water are being pulled in opposite directions by the Sun and moon.

Answers

Answer:

(B) The moon’s orbit is closer to Earth.

Explanation:

Answer:

B

Explanation:

A circuit has a resistance of 4.0 Ohms. What voltage will produce a current of 1.4 Amps in the circuit

Answers

Answer:

5.6 volts

Explanation:

According to Ohm's Law, V = IR

where V = voltage, I = Current and R = resistance

what is the acceleration of a box weighing 666N if a force of 777N is applied to it​

Answers

Answer:

6.67

Explanation:

force=mass*gravity(10)

666/10=66.6

777/66.6=11.6666667

round off

An 8.8-magnitude earthquake in Chile in 2010 killed more than 700 people. On January 12, 2010, a less powerful earthquake, measuring 7.0, killed more than 200,000 in Haiti. Why do you think this happened?

Answers

Answer:

The main reason for this is the engineering and technology driven building construction in Chile than in Haiti

Explanation:

The main reason for this is the engineering and technology driven building construction in Chile than in Haiti. Most of the buildings in Haiti do not fit in the building byelaws norms as most of them were constructed in a short period of time with less engineering and at cheaper rate. While building in Chile were built adhering to the building codes and byelaws.

The base of the building is Chile were separated from each other using the “base isolation” technology and the were also more flexible as compared to the buildings in Haiti.  

The skyscrapers in Chile were constructed in a way that they can float on the arrangements of ball bearings and padded cylinders

WILL GIVE BRAINLIEST ASAP

1. Identify and describe two factor which will effect the...

A. gravitational potential energy of a system

B. magnetic potential energy

Answers

Explanation:

1. Height Relatives to reference point, Mass, and strength of the gravitational field it's in

2. Distance in the magnetic field

¿Cuál es la formula para resolver la caída libre?

Answers

Caída Libre

h= v0 t+1/2 g t2

vf = v0 + g t

?

A complete, unbroken path through which electric charges can flow is a(n)
a.
electric circuit.
b.
electrical resistance.
c.
magnetic field line.
d.
magnetic pole.

Answers

Answer:

a.

electric circuit.

Explanation:

A path through which electric charges flow. A continuous, unbroken path through which electrons can flow is a closed circuit. Charges, or current, can flow only through a closed circuit. A break or opening in a circuit creates an open circuit.

Answer:

The answer would be A

Explanation:

An electric circuit.

Hope this helped!

"No one's like me, I'm Harley frickin' Quinn"!

-Harley Quinn (Birds of Prey)

Un móvil parte desde un punto ubicado a +10 Km del origen ,se mueve en línea recta llegando hasta el Km 60, donde cambia su sentido de movimiento, regresando al Km 32 .Entonces el desplazamiento o cambio de posición y la distancia recorrida son respectivamente: A) 22 km y 78 km B) -22 km y 78 km C) -18 km y 38 km D) -18 km y 18 km E) 10 km y 32 km

Answers

Answer:

La opción correcta es la A) 22 km y 78 km.

Explanation:

Dado que el desplazamiento (D) es un vector, su valor viene dado por la suma algebraica de los vectores del desplazamiento de ambos tramos.

Como en el primer tramo movil se mueve en la dirección de x-positiva y en el segundo tramo se mueve en el sentido de x-negativo, tenemos:

[tex] D = (60 km - 10 km) - (60 km - 32 km) = 22 km [/tex]  

Ahora, la distancia (d) es una magnitud escalar, por lo que su valor viene dado por la suma del desplazamiento de ambos tramos:

[tex] d = (60 km - 10 km) + (60 km - 32 km) = 78 km [/tex]                

Por lo tanto, la opción correcta es la opción A) 22 km y 78 km.

Espero que te sea de utilidad!                              

What do waves transfer? Question 1 options: matter energy water particles

Answers

Waves transfer energy over distance without moving matter the entire distance. So your answer would be energy.

This diagram shows a heating curve for water.

At which segment does freezing occur?



The answer is B.) W-V
Hope this helps

Answers

Answer:

it is B

Explanation:

Because I agree with her and also got 100

a pine raft (density = 373 kg/m^3) has a volume of 1.43 m^3. How much of the raft's volume is below the water line? Unit is m^3​

Answers

Answer: 0.5334

Explanation:

i got it right on accellus :p

Volume of value V = 0.5333 [tex]m^{3}[/tex]  is below the water line .

What is Archimedes principal ?

Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force equal to the weight of the displaced fluid.

F(b) = rho*g*V

F(b) = buoyant force

rho = fluid density

g = acceleration due to gravity

V = fluid volume

given

density of raft = 373 kg/[tex]m^{3}[/tex]

volume of raft = 1.43 [tex]m^{3}[/tex]

since, density  = mass / volume

mass of raft = density * volume

                    = 373 * 1.43 = 533.3 kg

using Archimedes principal

Force = density of liquid * volume of liquid displaced * acceleration due to                gravity

  mg        = 1000 * V * 9.8

  533.3 * 9.8 = 1000 * V * 9.8

  V = 0.5333 [tex]m^{3}[/tex]

To learn more about Archimedes principal here

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Explain one inference scientists made about the interior of the Earth based on seismic waves. Use the words S & P waves in your answer. Use the word refract/bend in your answer

Answers

Answer:

"An earthquake radiates P and S waves in all directions and the interaction of the P and S waves with Earth's surface and shallow structure produces surface waves. Near an earthquake the shaking is large and dominated by shear-waves and short-period surface waves."  please rephrase this in your own words.

Explanation:

Im not sure if this helps but credits to: eqseis.geosc.psu.edu › Notes › waves_and_interior

Describe the role that weathering and erosion play in the rock cycle.

Answers

Answer:

Weathering is the breaking down or dissolving of rocks and minerals on Earths surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.

plz can i get brainliest

After the full moon, the moon begins its shrinking or_phases. During these phases, the light side of the moon is on the_
A. Waning, left
B. Waxing, right
C. Waxing, left
D. Waning, right

Answers

I believe the answer is b

Spatial awareness is knowing where you are in relationship to teammates, opponents, and the field of play.

O. Truth
O. False

Answers

Answer:

A.) True

Explanation:

"Spatial awareness refers to being aware of your surroundings and your position relative to them. "

-healthline.com

It's essentially knowing where you are in the field, and who/what's around you.

It’s true!!!:) trust me 100% true

Describe the energy transformations that must occur from batteries to the light in remote control. Can you think of any other objects where the same energy transformation occurs?

Answers

Answer:

Pressing the button: Mechanical to electrical  

Waste energy from this step: Mechanical to heat  

Converting electrical signal to IR: electrical to electromagnetic (infrared rays)  

Waste energy from this step: electrical to heat  

Chemical energy from battery: chemical to electrical

Explanation:

3. The shrillness of sound is known as_________​

Answers

Answer:

pitched sound

Explanation:

The shrillness of sound is known as   Pitched Sound

Please mark me as brilliant

plz plz plz

Answer:

pitch

Explanation:

the atomic mass unit (amu) is

a. the mass of a single atom of carbon
b. one millionth of a gram
c. approximately the mass of a proton
d. approximately the mass of an electron

(dont send me a link please)

Answers

Answer:

The correct option is (a).

Explanation:

One Atomic mass unit is the mass of an atom. It is defined as the mass of a single carbon -12 at rest.

The relation between amu and kg is given by :

[tex]1\ amu=1.66\times 10^{-27}\ kg[/tex]

Hence, one amu is equal to the mass of a single atom of carbon.

A negative charge of 4.0 x 10 C and a positive charge of 7.0 x 10 C are separated by 0.15 m. What is
the force between the two charges?

Answers

Answer:

112×10^12N

Explanation:

We use the following equation to find the force between two charges that are away from each other at a particular distance:

F=k×q1×q2/r^2 F=9×10^9×4×10×7×10/(0.15)^2 F=252×10^11/0.225 F=1120×10^11=112×10^12

What does non-contact forcemean?

Answers

Answer:

A non-contact force is a force applied to an object by another body that is not in direct contact with it.

Explanation:

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