Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

ques 1: Let K1 be the maximum kinetic energy of photoelectrons emitted by a light of wavelength λ1 and K2 corresponding to λ2. If λ1 = 2λ2 , then :(A) 2K1 = K2    (B) K1 = 2K2         (C) K1 < 2K2    (D) K1 > 2K2
 
ques 2:  In a hypothetical system a particle of mass m and charge –3q is moving around a very heavy particle having charge q. Assuming Bohr’s model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is (A)fraction numerator 3 q squared space over denominator 2 epsilon subscript 0 space end subscript h end fraction (B) fraction numerator 3 q squared over denominator 4 epsilon subscript 0 h end fraction   (C) fraction numerator 3 q over denominator 2 epsilon subscript 0 h end fraction (D)fraction numerator 3 q over denominator 4 epsilon subscript 0 h end fraction
Asked by yugibo | 13 Apr, 2016, 12:35: PM
answered-by-expert Expert Answer
 
NOTE: Kindly post the other question as a separate query.
Answered by Romal Bhansali | 13 Apr, 2016, 04:39: PM
Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
consider a hypothesis H-like atom, the wavelength in Amstrong for the spectral lines for the transition from n=p to n=1 is given as  wavelength =1500p^2/p^2 -1 where p>1 find the minimum and maximum wavelength
Asked by Akshatkuma2004 | 04 Jul, 2021, 04:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Why emission spectra are seen in only those gases which have low density or low number of collisions?
Asked by rsrakesh932 | 12 Jun, 2020, 04:38: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
How to obtain bright fringes by young double slit experiment. ??
Asked by yadavnitish688 | 14 Dec, 2019, 06:04: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is the radius of an electron?
Asked by sidiz.shrestha07 | 26 May, 2019, 06:42: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
THE VALUE OF GROUND  STATE ENERGY OF HYDROGEN ATOM IS -13.6eV WHAT DOES THE NEGATIVE SIGN SIGNIFY AND HOW MUCH ENERGY IS REQUIRED TO TAKE AN ELECTRON IN THIS ATOM FROM GROUND STATE TO THE FIRST EXCITED STATE ?
Asked by pardeepkumar2281 | 28 Feb, 2019, 07:24: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is the order of velocity of an electron in H atom in ground state ?
Asked by pradeepjsme | 30 Jan, 2019, 03:54: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is the order of velocity of an electron in a H-atom in ground state?
Asked by pradeepjsme | 30 Jan, 2019, 03:51: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Using de Boglie's hypothesis, explain with the help of a suitable diagram, Bohr's second postulate of quantisation of energy levels in a hydrogen atom.
Asked by rohitraman1115 | 14 Jan, 2019, 12:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
The ground state energy of hydrogen atom is -13.6eV. What are the kinetic and potential energies of the electron in this state?
Asked by rohitraman1115 | 14 Jan, 2019, 12:01: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×