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JEE Main 2014 (Online) 11th April Morning Slot
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2
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60 mins
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IIT-JEE Main - Previous Year Papers
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2014 · Physics · Electricity · Electromagnetic Waves
JEE Main 2014 (Online) 11th April Morning Slot
Match the List - I (Phenomenon associated with electromagnetic radiation) with List - II (Part of electromagnetic spectrum) and select the correct code from the choices given the lists :
| List - I | List - II | ||
|---|---|---|---|
| (I) | Doublet of sodium | (A) | Visible radiation |
| (II) | Wavelength corresponding to temperature associated with the isotropic radiation filling all space |
(B) | Microwave |
| (III | Wavelength emitted by atomic hydrogen in interstellar space |
(C) | Short radiowave |
| (IV) | Wavelength of radiation arising from two close energy levels in hydrogen |
(D) | X - rays |
2014 · Physics · Electricity · Electromagnetic Waves
JEE Main 2014 (Online) 11th April Morning Slot
An electromagnetic wave of frequency 1 \(\times\) 1014 hertz is propagating along z - axis. The amplitude of electric field is 4 V/m. If \(\in\)0 = 8.8 \(\times\) 10\(-\)12 C2/N-m2, then average energy density of electric field will be :