CBSE Class 11 science: Beats Videos | Waves

• Define beats.  Give the analytical treatment of beats.
• A set of 28 tuning forks is arranged in a series of decreasing frequencies.  The first tuning fork is higher ocatve of last tuning fork.  When the two consecutive tuning forks are sound together, 4 beats are produced.  Find the frequency of first and last tuning fork.
• Two waves of wavelengths 1m and 1.02m produce 13 beats in 2 seconds in air at NTP.  Find the velocity of air at NTP.
• What is the difference between interference and beats?
• (i)  A tuning fork T produces n beats/sec with another fork S whose frequency is known to be n₁. When T is loaded with wax, the beat frequency decreases.  What is the frequency of T? (ii)  On loading T if the beat frequency increases, what will be the frequency of T?
• (i)  What are beats?  Name the basic phenomenon due to which beats are produced. (ii)  Two sources of sound are producing waves of frequency n₁ and n₂, where (n₁ - n₂) is small.  Show mathematically that the beat frequency is (n₁ - n₂).
• In an experiment it was found that a tuning fork and a sonometer gave 5 beats per second, both when the length of the wire was 1 m and 0.05 m. Calculate the frequency of the fork.
• Two open end organ pipes of length 50 cm and 50.5 cm produce 3 beats/sec.  Calculate the velocity of sound in air.
• A note produces 7 beats with tuning fork A of frequency 256 Hz and 3 beats with tuning fork B of frequency 266 Hz.  Find the frequency of note.
• A tuning fork gives 3 beats per second with sonometer wire when its length is either 49.8 cm of 50.2 cm.  Find the frequency of tuning fork.

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