English

In Hydrogen, the electron jumps from the fourth orbit to the second orbit. The wavenumber of the radiations emitted by an electron is ______ - Physics

Advertisements
Advertisements

Question

In Hydrogen, the electron jumps from the fourth orbit to the second orbit. The wavenumber of the radiations emitted by an electron is ______  

Options

  • `"R"/16`

  • `(3"R")/16`

  • `(5"R")/16`

  • `(7"R")/16`

MCQ
Fill in the Blanks
Advertisements

Solution

In Hydrogen, the electron jumps from the fourth orbit to the second orbit. The wavenumber of the radiations emitted by an electron is `underline((3"R")/16).`

shaalaa.com
  Is there an error in this question or solution?
Chapter 15: Structure of Atoms and Nuclei - MCQ’S

APPEARS IN

SCERT Maharashtra Physics [English] 12 Standard HSC
Chapter 15 Structure of Atoms and Nuclei
MCQ’S | Q 7

RELATED QUESTIONS

What is gamma decay?


Sample of carbon obtained from any living organism has a decay rate of 15.3 decays per gram per minute. A sample of carbon obtained from very old charcoal shows a disintegration rate of 12.3 disintegrations per gram per minute. Determine the age of the old sample given the decay constant of carbon to be 3.839 × 10−12per second.


Complete the following equation describing nuclear decay.

\[\ce{_88^226Ra->_2^4\alpha {+}}\] ______.


Complete the following equation describing nuclear decay.

\[\ce{_90^228Th->\alpha { +}}\] _____


Choose the correct option.

\[\ce{^60_27CO}\] decays with a half-life of 5.27 years to produce \[\ce{^60_28Ni}\]. What is the decay constant for such radioactive disintegration?


The half-life of 67Ga is 78 h. How long will it take to decay 12% of the sample of Ga?


65% of 111In sample decays in 4.2 d. What is its half-life?


A 3/4 of the original amount of radioisotope decays in 60 minutes. What is its half-life?


The half-life of radon is 3.82 d. By what time would 99.9% of radon will be decayed?


The decay constant λ of a certain radioactive material is 0.2166 per day. The average life τ of the radioactive material is ______ 


Show that half life period of radioactive material varies inversely to decay constant λ.


The half-life of a certain radioactive nucleus is 3.2 days. Calculate (i) decay constant (ii) average life of radioactive nucleus.


A radioactive substance decays to (1/10)th of its original value in 56 days. Calculate its decay constant. 


A radioactive nucleus emits 4 α-particles and 7 β-particles in succession. The ratio of number of neutrons of that of protons, is
[A = mass number, Z =atomic number]


A radioactive substance of half-life 69.3 days is kept in a container. The time in which 80% of the substance will disintegrate will be ______

[take ln(5) = 1.61]


The rate of radioactive disintegration at an instant for a radioactive sample of half-life 2.2 x 109 s is 1010 s-1. The number of radioactive atoms in that sample at that instant is, ______ 


The activity of a radioactive sample ____________.


A radioactive substance has half life of 3 hours. 75 % of the substance would decay in ____________.


What is beta decay?


The radioactivity of a sample is R1 at a time T1 and R2 at a time T2. If the half-life of the specimen is T, the number of atoms that have disintegrated in the time (T1 - T2) is proportional to ______.


A radioactive sample S1​ having the activity A1​ has twice the number of nuclei as another sample S2​ of activity A2​ If A2​ = 2A1​ then the ratio of half-life of S1​ to the half-life of S2​ is ______.


The graph obtained by plotting loge (A) [A is the activity of a radioactive sample] against t (time) out of the following is:


If the number of nuclei of a radioactive substance becomes `1/e` times the initial number in 10 days, what is the decay constant of the substance?


Show that the number of nuclei of a radioactive material decreases exponentially with time.


Define half-life period.


In one mean lifetime of a radioactive element the fraction of the nuclei that has disintegrated is ______. [e is the base of natural logarithm]


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×