If you set up the seventh harmonic on a string fixed at both ends, how many nodes and antinodes are set up in it
$8, 7$
$7, 7$
$8, 9$
$9, 8$
A stretched string of length $l,$ fixed at both ends can sustain stationary waves of wavelength $\lambda ,$ given by
A tuning fork gives $4$ beats with $50\, cm$ length of a sonometer wire if the length of the wire is shortened by $1\, cm$. the no. of beats still the same. The frequency of the fork is -............. $\mathrm{Hz}$
In Melde's experiment, the string vibrates in $4$ loops when a $50 \,gram$ weight is placed in the pan of weight $15\, gram.$ To make the string to vibrates in $6$ loops the weight that has to be removed from the pan is
A pipe $20$ $\mathrm{cm}$ long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a source of $1237.5$ $\mathrm{Hz}$ ?( sound velocity in air $= 330$ $\mathrm{m/s}$ ).
When a wave travelling in medium is reflected from the boundary of a denser medium, which of the following will not change?