Question:
The greatest wavelength of the radiation that will ionize unexcited hydrogen atom is
The greatest wavelength of the radiation that will ionize unexcited hydrogen atom is
Show Hint
Greater wavelength $\Rightarrow$ lower energy (use \( E \propto \frac{1}{\lambda} \)).
Updated On: Apr 21, 2026
- \(1820\,\text{\AA} \)
- \(450\,\text{\AA} \)
- \(910\,\text{\AA} \)
- \(700\,\text{\AA} \)
- \(1400\,\text{\AA} \)
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Concept:
Ionization energy of hydrogen:
\[
E = 13.6\,\text{eV}
\]
Step 1: Relation.
\[ \lambda = \frac{hc}{E} \]
Step 2: Result.
Maximum wavelength corresponds to minimum energy: \[ \lambda = 910\,\text{\AA} \]
Step 1: Relation.
\[ \lambda = \frac{hc}{E} \]
Step 2: Result.
Maximum wavelength corresponds to minimum energy: \[ \lambda = 910\,\text{\AA} \]
Was this answer helpful?
0
0
Top KEAM Physics Questions
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- Two capillary tubes A and B of diameter $1\, mm$ and $2\, mm$ respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is
- In the circuit given in figure, 1 and 2 are ammeters. Just after key K is pressed to complete the circuit, the reading will be
- A plate has a length $ 5\pm 0.1\text{ }cm $ and breadth $ 2\pm 0.01\text{ }cm $ . Then the area of the plate is:
View More Questions
Top KEAM Atoms and Nuclei Questions
- A nucleus has a mass number of 56 and a binding energy per nucleon of 8.8 MeV, the total B.E is?
- The value of one barn in SI unit is
- If the volume of nucleus having mass number 2 is V, then that for the nucleus having mass number 8 is
- The mean momentum of a nucleon in a nucleus with mass number A varies as
- For atoms, which of the following statement is correct? (A) Heavier nuclei have more neutrons
View More Questions
Top KEAM Questions
- i.$\quad$ They help in respiration ii.$\quad$ They help in cell wall formation iii.$\quad$ They help in DNA replication iv. $\quad$They increase surface area of plasma membrane Which of the following prokaryotic structures has all the above roles?
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- If $\int e^{2x}f' \left(x\right)dx =g \left(x\right)$, then $ \int\left(e^{2x}f\left(x\right) + e^{2x} f' \left(x\right)\right)dx =$
View More Questions