Electromagnetic Waves · JEE Main previous year questions

2012 2 questions

1. Q512012 · 26 May 2012 · Shift 1

   The frequency of $X$-rays; $\gamma$-rays and ultraviolet rays are respectively $a,b$ and $c$ then

   1. A.$a<b;b>c$
   2. B.$a>b;b>c$
   3. C.$a<b<c$
   4. D.$a=b=c$
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   Answer: A

2. Q572012 · 12 May 2012 · Shift 1

   A $10\mathrm{kW}$ transmitter emits radio waves of wavelength $500\mathrm{m}$. The number of photons emitted per second by the transmitter is of the order of

   1. A.$10^{37}$
   2. B.$10^{31}$
   3. C.$10^{25}$
   4. D.$10^{43}$
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   Answer: B