Question
Two sound sources produce 20 beats in 5s. By how much do their frequencies differ?
✓
Answer
Number of beats per second $=\frac{20}{5}=4$
$\therefore \text{V}_1-\text{V}_2=4.$
$\therefore \text{V}_1-\text{V}_2=4.$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A bullet travelling with a velocity of 16m/s penetrates a tree trunk and comes to rest in 0.4m. Find the time taken during the retardation.
A car weighing 1400kg is moving at a speed of 54km/h up a hill when the motor stops. If it is just able to reach the destination which is at a height of 10m above the point, calculate the work done against friction (negative of the work done by the friction).
Water rises to a height of 10 cm in a capillary tube. If the surface tension of water is $73 \times$ $10^{-3} N / m$ and density is $1 \times 10^3 kg / m ^3$ and $g=9.8 m /$ $s^2$ then find the radius of capillary tube.
→Why does a cycle tube burst in summer?
Two unequal resistances $R_1$ and $R_2$ are connected across two identical batteries of emf $\varepsilon$ and internal resistance r. Can the thermal energies developed in $R_1$ and $R_2$ be equal in a given time. If yes, what will be the condition?
→Define angular acceleration.
Calculate the power of a crane in watts, which lifts a mass of 100kg to a height of 10 m in 20s.
A satellite is revolving just near the Earth's surface. Compute its orbital velocity. Given that radius of Earth $\mathrm{R}= 6400 km $ and $3=9.8 \mathrm{~ms}^{-2}$.
→Disc of mass $M$ and radius $R$ are fixed on the edges of a massless rod of length $2 R$. Find the moment of inertia of this system perpendicular to the rod and relative to the axis passing through its center.
→A block of mass m moving at a speed v compresses a spring through a distance x before its speed is halved. Find the spring constant of the spring.