Download App

Sound Waves — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSound Waves2 Marks
Question
Figure, shows a person standing somewhere in between two identical tuning forks, each vibrating at 512Hz. If both the tuning fbrks move towards right at a speed of 5.5m/s, find the number of beats heard by the listener. Speed of sound in air = 330m/s.
✓

Answer



According to the data, $V_s= 5.5m/s$ for each turning fork.
So, the apparent frequency heard from the tuning fork on the left,
$\text{f}'=\Big(\frac{330}{330-5.5}\Big)\times512=527.36\text{Hz}=527.5\text{Hz}$
Similarly, apparent frequency from the tunning fork on the right,
$\text{f}'=\Big(\frac{330}{330-5.5}\Big)\times512=510\text{Hz}$
So, beats produced $527.5-510=17.5\text{Hz}.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Sound Waves→Sound Waves — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

When the last image of the telescope is formed at infinity, then what is the length of its tube? If the image is formed at the minimum distance of clear vision then will the length be less or more than before?
→
A long narrow horizontal slit is placed 1mm above a horizontal plane mirror. The interference between the light coming directly from the slit and that after reflection is seen on a screen 1.0m away from the slit. Find the fringe-width if the light used has a wavelength of 700nm.
→
The alternating current in a circuit is described by the graph shown in Fig. Show rms current in this graph.
→
A barometer is constructed with its tube having radius 1.0mm. Assume that the surface of mercury in the tube is spherical in shape. If the atmospheric pressure is equal to 76cm of mercury, what will be the height raised in the barometer tube. The contact angle of mercury with glass $= 135^\circ$ and surface tension of mercury = 0.465N/m. Density of mercury $= 13600kg/m^3$.
→
Answer the following questions:
A capacitor is used in the primary circuit of an induction coil.
→
Can you add two vectors representing physical quantities having different dimensions? Can you multiply two vectors representing physical quantities having different dimensions?
→
Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other force the magnets are pulled towards each other and their kinetic energy increases. Does it contradict our earher knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?
→
A charged 30μF capacitor is connected to a 27mH inductor. What is the angular frequency of free oscillations of the circuit?
→
Write down the equation of displacement current and derive the Ampere $-$ Maxwell's law.
→
Explain ray of light and beam of light.
→