List of top Physics Questions on Electromagnetic waves asked in AFMC

Which scientist experimentally proved the existance of electromagnetic waves?

$v_{rms}, v_{av} $ and $v_{mp}$ are root mean square, average and most probable speeds of molecules of a gas obeying Maxwellian velocity distribution. Which of the following statements is correct?

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Two closed organ pipes $100\, cm $ and $101 \,cm$ long gives $16$ beats in $20 \,s$, when each pipe is sounded in its fundamental mode. Calculate the velocity of sound: