Atomic Structure Questions | Chemistry JEE Main Important Questions

Q 1 :
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency $' A' \times 10^{12}$ hertz and that has a radiant intensity in that direction of $\frac{1}{' B'}$ watt per steradian.

'A' and 'B' are respectively. [2024]

450 and 683
540 and $\frac{1}{683}$
540 and 683
450 and $\frac{1}{683}$

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(C) The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency $540 \times 10^{12}$ Hz and that has a radiant intensity in that direction of $\frac{1}{683}$ watt per steradian.

Q 2 :
The ionization energy of sodium in kJ $m o l^{- 1}$ , if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is ________ . [2024]

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(494) Energy of photon $E_{p}$ is :

$E_{p} = \frac{h c}{λ} = \frac{6.626 \times 10^{- 34} Js \times 3 \times 10^{8} {ms}^{- 1}}{242 \times 10^{- 9} m}$

lonization energy of one atom of sodium

$= Energy of one photon = \frac{6.626 \times 10^{- 34} \times 3 \times 10^{8}}{242 \times 10^{- 9}} J$

Ionization energy of one mol of sodium atoms

$= \frac{6.626 \times 10^{- 34} \times 3 \times 10^{8}}{242 \times 10^{- 9}} \times 6.022 \times 10^{23} \times \frac{1}{1000} kJ$

$= 494.65 {kJmol}^{- 1}$

Q 3 :
Wave number for a radiation having 5800 $Å$ wavelength is $x \times 10 c m^{- 1}$ . The value of $x$ is ____________ . (Integer answer) [2024]

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(1724) $Wave number (\bar{ν}) is reciprocal of wavelength (λ) .$

$\bar{ν} = \frac{1}{λ} = \frac{1}{5800 Å} = \frac{1}{5800 \times 10^{- 8} cm} = 1724.138 \times 10 {cm}^{- 1}$

Topic Question Set

Q 1 :
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency $' A' \times 10^{12}$ hertz and that has a radiant intensity in that direction of $\frac{1}{' B'}$ watt per steradian.

'A' and 'B' are respectively. [2024]

Q 2 :
The ionization energy of sodium in kJ $m o l^{- 1}$ , if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is ________ . [2024]

0%

Q 3 :
Wave number for a radiation having 5800 $Å$ wavelength is $x \times 10 c m^{- 1}$ . The value of $x$ is ____________ . (Integer answer) [2024]

0%

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Topic Question Set

Q 1 : The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A'×1012 hertz and that has a radiant intensity in that direction of 1'B' watt per steradian. 'A' and 'B' are respectively. [2024]

Q 2 : The ionization energy of sodium in kJ mol-1, if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is ________ . [2024]

0%

Q 3 : Wave number for a radiation having 5800Å wavelength is x×10cm-1. The value of x is ____________ . (Integer answer) [2024]

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Q 1 :
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency $' A' \times 10^{12}$ hertz and that has a radiant intensity in that direction of $\frac{1}{' B'}$ watt per steradian.

'A' and 'B' are respectively. [2024]

Q 2 :
The ionization energy of sodium in kJ $m o l^{- 1}$ , if electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is ________ . [2024]

Q 3 :
Wave number for a radiation having 5800 $Å$ wavelength is $x \times 10 c m^{- 1}$ . The value of $x$ is ____________ . (Integer answer) [2024]