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Questions : #48, #49 & #50 (In Hindi)
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In this lesson, questions #48, #49 & #50 are solved. Watch all the questions and keep practicing

Kumar Ketan is teaching live on Unacademy Plus

Kumar Ketan
#Specialisation in Electronics #6 years teaching experience #Physics Faculty in Kota #"magical education" (231k+ subs) #Writer

Unacademy user
Thank you mam, you are doing a great job. While watching your videos I came to know many grammatical mistakes that I was doing before but now I'm able to make good sentences.
Thanks and welcome. Hope you do well in future.
Sir part 2 jalid chaiye khali 20 days bache hai jee mains ko! plz make fast specially in nuclear physics
thanku sir...completed this course...
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  2. 26.4k views 4.9 unacademy Kumar Ketan #16 Educator in IIT JEE #6 years teaching experience #IT JEE Physics #YouTuber (150k+ subs) #Unacademy educator(25kt lifetimeviews) #Under graduate topper Follow me on the Unacademy Learning App 1.3k 2 26 Followers Following Courses Get updates about new courses Watch all my lessons .Download slides and watch offline Lists (1) Kumar Ketan HINDI IIT JEE Physics by Kumar Ketan for lIT JEE 8 4 saves Kumar Ketan

  3. #Q.48 According to Moseley's law, the ratio of the slop of graph between /f and Z for Ks and Ka is 27 b) 32 32 a) 27 36 d) 5 36

  4. 2 1 2 slope oc 2 2 9 32 slope, slope2 2 2

  5. #Q.49 If the electron in hydrogen orbit jumps from third orbit to second orbit, the wavelength of the emitted radiation is given by b) A- 6 36 5R 5R 36 c) d)

  6. Soln.1 2 In 4 9 36 36 5R

  7. #Q.50 A potential of 10000 V is applied across an X-ray tube. Find the ratio of de-Broglie wavelength associated with incident electrons to the minimum wavelength associated with X- rays.(Given, e/m 1.8x10 C/kg for electrons) a) 10 b) 20 c) 1/10 d) 1/20

  8. Soln. Energy of electron 10000eV 1500.122 (in A) 110000 , in A)-103030-12 10000