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IGNOU BPHET 141 SOLVED ASSIGNMENT 2025

IGNOU BPHET 141 SOLVED ASSIGNMENT 2025


IGNOU BPHET 141 Solved Assignment 2025
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IGNOU BPHET 141 Solved Assignment 2025

This is latest Solved Assignment of BPHET 141 of BSCG . 

  • Latest 2025 Solved Assignment
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  • BPHET 141 ( Elements of Modern Physics )
  • Elements of Modern Physics 2025 Solved Assignment
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Last Date of Submission of IGNOU BPHET-141 (BSCG) 2025 Assignment is for January 2025 Session: 30th September, 2025 (for December 2025 Term End Exam).
Semester Wise
January 2025 Session:
30th March, 2025 (for June 2025 Term End Exam).
July 2025 Session: 30th September, 2025 (for December 2025 Term End Exam).

Title NameIGNOU BPHET 141 Solved Assignment 2025
TypeSoft Copy (E-Assignment) .pdf
UniversityIGNOU
DegreeBACHELOR DEGREE PROGRAMMES
Course CodeBSCG
Course NameBachelor of Science
Subject CodeBPHET 141
Subject NameElements of Modern Physics
Year2025
Session
LanguageEnglish Medium
Assignment CodeBPHET-141/Assignmentt-1//2025
Product DescriptionAssignment of BSCG (Bachelor of Science) 2025. Latest BPHET 141 2025 Solved Assignment Solutions
Last Date of IGNOU Assignment Submission
Last Date of Submission of IGNOU BPHET-141 (BSCG) 2025 Assignment is for January 2025 Session: 30th September, 2025 (for December 2025 Term End Exam).
Semester Wise
January 2025 Session:
30th March, 2025 (for June 2025 Term End Exam).
July 2025 Session: 30th September, 2025 (for December 2025 Term End Exam).

Rs. 80
Rs. 41
Questions Included in this Help Book

Ques 1.

A spacecraft A has a speed 0.80c with respect to the Earth. If the speed of another spacecraft B with respect to spacecraft A is 0.50c, what is the speed of B with respect to the Earth

Ques 2.

A particle is travelling through the Earth's atmosphere at a speed of 0.6c. To an Earth-bound observer, the distance it travels is 4.0 km. How far does the particle travel in its own frame of reference?

Ques 3.

A particle of rest mass 2.0 kg has an initial speed of 2x108ms-1. A constant relativistic force of magnitude 1.5x106 N is exerted on the particle in the same direction as the initial relativistic momentum for 1000 s. Calculate the magnitudes of the initial and final relativistic linear momentum and its final speed.

Ques 4.

A star emits light with wavelength 420 nm. An observer on earth measures the wavelength of the light received from the star to be 600 nm. Calculate the speed with which the star is moving.

Ques 5.

Determine the wavelengths of the photons scattered at (i) 60° and (ii) 90° when X- rays of wavelength 4.5 pm are scattered from a target.

Ques 6.

Calculate the de Broglie wavelength of a 87Rb atom that has been laser cooled to 200 µK. (Assume that the kinetic energy is 3/2kBT).

Ques 7.

Using Heisenberg's Uncertainty Principle explain whether a particle trapped inside a one dimensional box of finite length can be at rest.

Ques 8.

The quantum mechanical wave function for a particle isv given by

 

 

Determine (i) the normalization constant N and(ii) the most probable position of the particle.

Ques 9.

The eigenfunction of a particle confined in a box of length L ( 0 equation x equation L ) is

equation

Calculate equation and the probability of finding the particle between x = 0 and x = L / 4 .

Ques 10.

A particle encounters a step potential of height . V0 What is the reflection and transmission coefficient if E = 1.5V0 ? Show that R + T = 1.

Ques 11.

Show that, for a symmetric potential function (V(x) = V(-x)), the parity operator commutes with the Hamiltonian. What is the parity of the of the following eigenfunctions of a symmetric potential well of width 2a: (i) equation and (ii)

equation

Ques 12.

The half life of 51Cr is 27.70 days. After how many days will only 10% of the element be left over?

Ques 13.

Establish the relation for binding energy per nucleon for nuclei. Calculate the value of binding energy per nucleon for Given:

Mass of Ni : 63.9280 u

Mass of proton : 1.007825 u

Mass of neutron : 1.008665 u

Is this nucleus stable?

Ques 14.

A piece of wood from the ruins of an ancient dwelling was found to have a 14C activity of 14 disintegrations per minute per gram of its carbon content. The 14C activity of living wood is 16 disintegrations per minute per gram. How long ago did the tree die from which the wood sample came? Take half-life of radiocarbon as 5760 years.

Ques 15.

Calculate Q-Value of the reaction:

equation

Take equation

u and equation

Ques 16.

 

पृथ्वी के सापेक्ष एक अंतरिक्ष यान A की चाल 0.80c है। यदि एक अंतरिक्ष यान B, अंतरिक्ष यान A के सापेक्ष चाल 0.50c से गतिमान हो, तो पृथ्वी के सापेक्ष अंतरिक्ष यान B की चाल क्या होगी?

Ques 17.

एक कण पृथ्वी के वायुमंडल में 0.6c की चाल से चल रहा है। पृथ्वी पर स्थित प्रेक्षक उसके द्वारा चली गई दूरी का मान 4.0 km मापता है। अपने निर्देश तंत्र में कण द्वारा चली गई दूरी क्या है?

Ques 18.

 

विराम द्रव्यमान 2.0 kg वाले कण की आरंभिक चाल 2.0×108 ms-¹ है। परिमाण 1.5×106N का एक अचर आपेक्षिकीय बल उस कण पर उसके आरंभिक रैखिक संवेग की दिशा में 1000 s तक लगाया जाता है। कण के आंरभिक और अंतिम आपेक्षिकीय रैखिक संवेग का परिमाण और अंतिम चाल परिकलित करें।

Ques 19.

किसी लक्ष्य पर आपतित 4.5 pm तरंग दैर्ध्य वाली X-किरणें प्रकीर्ण होती हैं। (i) 60° और (ii) 90° पर प्रकीर्ण फोटॉनों का तरंग दैर्ध्य परिकलित करें।

Ques 20.

लेज़र द्वारा 200 µK के तापमान तक शीतलित किये गये 87Rb परमाणु की दे ब्रॉग्ली तरंगदैर्ध्य परिकलित करें। (गतिज ऊर्जा   मान लें।)

Ques 21.

हाइज़ेनबर्ग अनिश्चितता सिद्धांत के आधार पर समझाए कि क्या एक कण, जो एक परिमित लंबाई वाले एक-विम बक्स में परिरूद्ध है, विरामस्थ हो सकता है?

Ques 22.

एक कण का क्वांटम यांत्रिकीय तरंग फलन है:

equation

इसके लिए (i) प्रसामान्यीकरण नियतांक N और (ii) कण की वह स्थिति जहां उसके पाये जाने की प्रायिकता सबसे अधिक हो, निर्धारित करें।

Ques 23.

L लंबाई के बक्से में परिबद्ध (0

equation

equation का मान और कण के x = x = 0 और x = L/4 के बीच पाये जाने की प्रायिकता का परिकलन करें।

Ques 24.

कोई कण V0 ऊँचाई के एक सोपान विभव का सामना करता है। यदि E = 1.5V0, हो, तो परावर्तन एवं संचरण गुणांकों के मान क्या है? सिद्ध करें कि R+T=1 |

Ques 25.

सिद्ध करें कि किसी सममित विभव फलन (V(x) = V (-x)) के लिए पैरिटी संकारक हैमिल्टोनियन के साथ कम्यूट (commute) करता है। 2a चौड़ाई वाले सममित विभव कूप के निम्नलिखित तरंगफलनों की पैरिटी बताएं : (i) equation और (ii) equation |

Ques 26.

51 Cr की अर्ध. आयु 27.70 दिन है। कितने दिनों के बाद इस तत्त्व का केवल 10% बचेगा?

Ques 27.

) equation नाभिक के लिए प्रति न्यूक्लिऑन बंधन ऊर्जा का संबंध स्थापित करें। Ni न्यूक्लिऑन बंधन ऊर्जा परिकलित करें। दिया है: equationके लिए प्रति 

Ni का द्रव्यमान : 63.9280 u

प्रोट्रान का द्रव्यमान: 1.007825 u

न्यूट्रान का द्रव्यमान : 1.008665 u

क्या यह नाभिक स्थायी है?

Ques 28.

किसी प्राचीन बस्ती के खंडहरों से प्राप्त लकड़ी के एक टुकड़े में 14C सक्रियता प्रति ग्राम कार्बन की मात्रा के लिए 14 विघटन प्रति मिनट पाई गई। जीवित काष्ठ में 14Cसक्रियता 16 विघटन प्रति मिनट प्रति ग्राम होती है। जिस वृक्ष का अंश यह लकड़ी का टुकड़ा था उसकी मृत्यु कितने समय पूर्व हुई थी? रेडियोकार्बन की अर्ध-आयु 5760 वर्ष लीजिए। 

Ques 29.

निम्नलिखित प्रतिक्रिया में प्रतिक्रिया की ऊर्जा (Q-मान) की गणना करें:

equation

equation और

equation लें।

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Language English

 

 

 
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