MHT CET 2019 3rd May Morning Shift | Waves Question 171 | Physics

The fundamental frequency of sonometer wire increases by 9 Hz , if its tension is increased by $69 \%$, keeping the length constant. The frequency of the wire is

42 Hz

24 Hz

30 Hz

36 Hz

MHT CET 2019 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

A sonometer wire is in unison with a tuning fork, when it is stretched by weight $w$ and the corresponding resonating length is $L_4$. If the weight is reduced to $\left(\frac{w}{4}\right)$, the corresponding resonating length becomes $L_2$. The ratio $\left(\frac{L_1}{L_2}\right)$ is

$4: 1$

$1: 4$

$1: 2$

$2: 1$

MHT CET 2019 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

For formation of beats, two sound notes must have

different amplitudes and different frequencies

exactly equal frequencies only

exactly equal amplitudes only

nearly equal frequencies and equal amplitudes

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A stretched string fixed at both ends has ' $m$ ' nodes, then the length of the string will be

$(m-1) \frac{\lambda}{2}$

$\frac{(m+1) \lambda}{2}$

$\frac{m \lambda}{2}$

$(m-2) \frac{\lambda}{2}$

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