An electron in the hydrogen atom jumps from the first excited state to the ground state. What will be the percentage change in the speed of electron?

In series LCR circuit, the voltage across the inductance and the capacitance are not

If the temperature of a hot body is increased by $$50 \%$$, then the increase in the quantity of emitted heat radiation will be approximately

The second overtone of an open pipe has the same frequency as the first overtone of a closed pipe of length '$$L$$'. The length of the open pipe will be