 Find the best tutors and institutes for Class 12 Tuition

Find Best Class 12 Tuition

No matching category found.

No matching Locality found.

Outside India?

Search for topics

# A photon of wavelength 4.0 x m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate:i. The energy of the photon (eV).ii. The kinetic energy of the emission.Iii. The velocity of the photoelectron. Great Place To Be Learn

I) E = hv/wavelength =(6.626*10^-34)(3*10^8)/4*10^-7 = 4.9695*10^-19J ii)K.E=4.9695*10^-19/1.60*10^-19 =3.105eV

1. 4.97 ×10-19 / 1.602 ×10-19 eV 2. 0.97eV 3. 5084×105 ms-1

Energy of photon= hc/λ h=plank constant = 6.63* h*c= 1240 eV λ= wavelength of light E= / J E=3.102 eV 2.)Kinetic energy of emission= energy of photon- work function =3.102-2.13 eV = 0.972 eV 3.) kinetic energy of... read more

Energy of photon= hc/λ

h=plank constant = 6.63*

h*c= 1240 eV

λ= wavelength of light

E= / J

E=3.102 eV

2.)Kinetic energy of emission= energy of photon- work function

=3.102-2.13 eV

= 0.972 eV

3.) kinetic energy of electron = 1/2*m* = 0.972 eV

v=

=5.84 m/s Tutor

I) E = hv/wavelength =(6.626*10^-34)(3*10^8)/4*10^-7 = 4.969*10^-19 J

Energy of photon= hc/λ h=plank constant = 6.63* c=speed of light=3* h*c= 1240 eV λ= wavelength of light E= / joule E=3.102 eV 2.)Kinetic energy of emission= energy of photon- work function =3.102-2.13 eV ... read more

Energy of photon= hc/λ

h=plank constant = 6.63*

c=speed of light=3*

h*c= 1240 eV

λ= wavelength of light

E= / joule

E=3.102 eV

2.)Kinetic energy of emission= energy of photon- work function

=3.102-2.13 eV

= 0.972 eV

3.)Velocity of free Electrons

kinetic energy of electron = 1/2*m* = 0.972 eV

v=

=5.84 m/s

E=hc/wavelength=3.10ev K.E. of photoelectron = (KE of incident photon) - (Work Function of Metal)=3.10-2.13=0.87ev Velocity of photoelctron={2*k.E/m}^{0.5}=30um/sec

(1) Energy of the photon (E) = hν = hc/λ = (6.626×10-34 Js×3.0×108 ms-1)/4×10-7 m = 4.97×10-19 J= 4.97×10-19/1.602×10-19 eV (2) Kinetic energy of emission (1/2 mv2) = hν- hνo = 3.10-2.13 = 0.97 eV (3) 1/2 mv2 = 0.97 eV = 0.97×1.602×10-19... read more

(1) Energy of the photon (E) = hν = hc/λ = (6.626×10-34 Js×3.0×10ms-1)/4×10-7 m = 4.97×10-19 J
= 4.97×10-19/1.602×10-19 eV

(2) Kinetic energy of emission (1/2 mv2) = hν- hνo = 3.10-2.13 = 0.97 eV

(3) 1/2 mv= 0.97 eV = 0.97×1.602×10-19 J
⇒ 1/2×(9.11×10-31 kg)×v= 0.97×1.602×10-19 J
⇒ v= 0.341×1012 = 34.1×1010
⇒ v = 5.84×10ms-1

First of all we have to find the enenry(E) of Photon by using the Formula E=hc/λ here 'h' is the Plank's constant. 'c' is the Speed of light and λ is the wavelength Now we have to think what is the term "WORK FUNCTION" used in the Question WORK FUNCTION is the MINIMUM amount of... read more

First of all we have to find the enenry(E) of Photon by using the Formula

E=hc/λ

here 'h' is the Plank's constant.

'c' is the Speed of light

and λ is the wavelength

Now we have to think what is the term "WORK FUNCTION" used in the Question

WORK FUNCTION is the MINIMUM amount of energy required to release a ELECTRON from the Metal

It is given in the Question

Now we are able to give the answer of the 2nd part of the Question

i.e Kinetic energy of emission== Total energy of photon- Energy required for emission(work function)

Now the question is WHAT IS THE VELOCITY OF PHOTOELECTRON??

From 2nd part of Question We know the Kinetic Energy of Photoelectron.

Use the formula,

K.E= ½*mass*(velocity)²

for the value of "mass of electron" , "plank's constant" and "velocity of light "use your book.

THANK YOU

Related Questions  01 Mar
40 Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Related Lessons

Define static electricity. Define Eddy current. What is the difference between displacement and distance?
A

Kinematics Equation for 1 - D Motion with constant acceleration
1.3 EQUATIONS FOR RECTILINEAR MOTION If a particle changes its velocity from u to v in time t, with uniform acceleration a and undergoes a displacement S in that time, then (a) v = u +... Kinematics Parameters
1.1 SOME DEFINITIONS (a) Distance: Distance between two points is the length of actual path travelled by the particle. It is a scalar quantity. Unit : m(metre) (b) Displacement: Displacement... Find Class 12 Tuition near you

Looking for Class 12 Tuition ?

Find best Class 12 Tuition in your locality on UrbanPro.

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you

Find Best Class 12 Tuition ?

Find Now »

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 25 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 6.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more