Atoms - Quiz 8

ATOMS QUIZ-8

Dear Readers,

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. In X-ray tube, when the accelerating voltage V is halved, the difference between the wavelength of K_α line and minimum wavelength of continuous X-ray spectrum

•  Remains constant
•  Becomes more than two times
•  Becomes half
•  Becomes less than two times

Solution

Q2. When an electron jumps from a level n=4 to n=1, the momentum of the recoiled hydrogen atom will be

•  6.5×10^(-27) kg m s^(-1)
•  12.75×10^(-19) kg m s^(-1)
•  13.6×10^(-27) kg m s^(-1)
•  Zero

Solution

Q3. Two electrons are revolving around a nucleus at distances ‘r’ and ‘4r’. The ratio of their period is

•   1:4
•  4:1
•  8:1
•  1:8

Solution

Q4. A stationary hydrogen atom of mass M emits a photon corresponding to the first line of Lyman series. If R is the Rydberg’s constant, the velocity that the atom acquires is

•  3/4 Rh/M
•  Rh/4M
•  Rh/2M
•  Rh/M

Solution

Q5. Monochromatic radiations of wavelength λ are incident on a hydrogen sample in ground state. Hydrogen atom absorbs the light and subsequently emits radiations of 10 different wavelengths. The value of λ is nearly

•  203 nm
•  95 nm
•  80 nm
•  73 nm

Solution

Q6. If n≫1, then the dependence of frequency of photon emitted as a result of transition of an electron from n^th orbit to (n-1)^th orbit, on n will be

•  v∝1/n
•  v∝1/n^2
•  v∝1/n^3
•  v∝1/n^4

Solution

Q7. The ionization potential of H atoms is 13.6 V. The energy difference between n=2 and n=3 levels is nearest to

•  1.9 eV
•  2.3 eV
•  3.4 eV
•  4.5 eV

Solution

Q8. In the spectrum of singly ionized helium, the wavelength of a line observed is almost the same as the first line of Balmer series of hydrogen. It is due to transition of electron

•  From n_1=6 to n_2=4
•  From n_1=5 to n_2=3
•  From n_1=4 to n_2=2
•  From n_1=3 to n_2=2

Solution

Q9. A hydrogen atom is in an excited state of principal quantum number n. It emits a photon of wavelength λ when it returns to the ground state. The value of n is

•  √(λR(λR-1) )
•  √((λ(R-1))/λR)
•  √(λR/(λR-1))
•  √(λ(R-1))

Solution

Q10. A sample of hydrogen is bombarded by electrons. Through what potential difference should the electrons be accelerated so that third line of Lyman series be emitted?

•  2.55 V
•  10.2 V
•  12.09 V
• 12.75 V

Solution