SaraNextGen Study App [2023-24]
Last Updated On 01-06-2023 - By Jeesha Sara

The magnetic field associated with a light wave is given, at the origin, by B=B0[sin(3.14 107)ct + sin(6.28 7ct).  If this light gals on a silver plate having a work function of 4.7 eV, What will be the maximum kinetic energy of the photo electrons? (c=3 108ms−1,h=6.6 10−34 J-s)

a.

7.72eV

b.

8.52eV

c.

12.5eV

d.

6.82eV


Question ID - 50156 :-

The magnetic field associated with a light wave is given, at the origin, by B=B0[sin(3.14 107)ct + sin(6.28 7ct).  If this light gals on a silver plate having a work function of 4.7 eV, What will be the maximum kinetic energy of the photo electrons? (c=3 108ms−1,h=6.6 10−34 J-s)

a.

7.72eV

b.

8.52eV

c.

12.5eV

d.

6.82eV

1 Answer
5876 Votes
3537

Answer Key : (a) -

B1=B0sin( 107C)t + B0 sin(2 10−7C)t since there are two EM waves with different frequency, to get maximum kinetic energy we take the photon with higher frequency

B1=B0sin( 107C)t  V1=

B2=B0sin(2 107C)t  V2= 10C

Where C is speed of light C=3 10m/s

V2 V1

So KE of photoelectron will be maximum for photon of higher energy.

V2 =107CHz

hv= +KEmax

energy of photon

Eph=hv=6.6 10−34 10−7 3 109

Eph=6.6 3 10−19J

       =

KEmax =Eph

=12.375−4.7

=7.675eV  7.7 eV



Next Question :

Let ABCD be a parallelogram and ABEF be a rectangle with EF lying along the line C. If AB = 7 cm and BE = 6.5 cm, then the area of parallelogram is  

(a)

11.375 cm2

(b)

22.75 cm2

(c)

45 cm2

(d)

45.5 cm2


View Topper Answer

We hope we have given the updated helpful answer / content for your query in an easily accessible format to help you in preparing adequately. We do offer free support materials, 10th maths guide, 10th science guide, 10th tamil guide, 10th social guide, 10th english guide, science 10th guide and also for all the classes books and guide to all the students who sign up for SaraNextGen. Apart from traditional textbook queries, we've got conjointly provided further high order level thinking issues, that are seemingly to be expected in boards and competitive exams. It includes conceptual queries, MCQs, Long and short answer type queries, etc. These Questions are designed to learn each student and academics by providing chapter-wise further issues focusing totally on testing conceptual information with applications. Here, we've got provided a number of the necessary ways in which within which the solutions of all the Questions will profit students of class 1 to 12. If you have any queries, drop a message to us and we will get back to you at the earliest.


SaraNextGen