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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

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

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प्रश्न

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

पर्याय

  • `"R"/16`

  • `(3"R")/16`

  • `(5"R")/16`

  • `(7"R")/16`

MCQ
रिकाम्या जागा भरा
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उत्तर

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).`

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 15: Structure of Atoms and Nuclei - MCQ’S

संबंधित प्रश्‍न

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.


Describe alpha, beta and gamma decays and write down the formulae for the energies generated in each of these decays.


Complete the following equation describing nuclear decay.

\[\ce{_8^19O->e^- { +}}\] _____


Complete the following equation describing nuclear decay.

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


Complete the following equation describing nuclear decay.

\[\ce{_7^12N -> _6^12C {+}}\] ______


The half-life of 18F is 110 minutes. What fraction of 18F sample decays in 20 minutes?


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 ______ 


The half-life of a certain radioactive species is 6.93 × 105 seconds. What is the decay constant?  


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.


Obtain an expression for the half-lifetime of radioactive material. Hence state the relation between an average life and half life time of radioactive material.


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]


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


What is alpha decay?


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 element has rate of disintegration 10,000 disintegrations per minute at a particular instant. After four minutes it become 2500 disintegrations per minute. The decay constant per minute is ______.


For radioactive substances, the fraction of its initial quantity (N0) which will disintegrate in its average lifetime is about ______.

(e = 2.71)


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


The disintegration rate of a radio-active sample is 1010 per hour at 20 hours from the start. It reduces to 5 × 109 per hour after 30 hours. Calculate the decay constant.


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


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