Related InterviewSolutions

• A car is moving along X-axis with a velocity `v=20m//s`. It sounds a whistle of frequency 660 Hz. If the speed of sound is `340m//s`. The apparent frequency heard by the observer `O` (shown in figure) is:A. `680Hz`B. `640 Hz`C. `700Hz`D. `720Hz`
• A source sound is moving with constant velocity of `20m//s` emitting a note of frequency `1000 Hz`. The ratio of frequencies observed by a stationary observer while the source approaching him and after it crosses him will be source is approaching him and after it crosses him will beA. `9:8`B. `8:9`C. `1:1`D. `9:10`
• A string of length 2 m is fixed at both ends. If this string vibrates in its fourth normal mode with a frequency of 500 Hz then the waves wouldf travel on it is with a velocity ofA. `125 m//s`B. `25m//s`C. `500 m//s`D. `1000 m//s`
• A fork A has frequency `2%` more than the standard fork and B has a frequency `3%` less than the frequency of same standard frok. The forks A and B when sounded together produced 6 beats/s. The frequency of fork A isA. `116.4 Hz`B. `120 Hz`C. `122.4 Hz`D. `238.8 Hz`
• The freuquency of tuning forks A and B are respectively `3%` more and `2%` less than the frequency of tuning fork `C`. When A and B are simultaneously excited, 5 beats per second are produced. Then the frequency of the tuning fork `A` (in Hz)` IsA. `98`B. `100`C. `103`D. `105`
• A wire of length l having tension T and radius `r` vibrates with fundamental frequency `f`. Another wire of the same metal with length `2l` having tension `2T` and radius `2r` will vibrate with fundamental frequency :A. `f`B. `2f`C. `(f)/(2sqrt2)`D. `(f)/(2)sqrt2`
• An open organ pipe of length L resonates at fundamental frequency with closed organ pipe. Find the length of closed organ pipe.A. `2L`B. `L//2`C. `Lsqrt2`D. `Lsqrt3//2`
• A closed organ pipe and an open organ pipe are tuned to the same fundamental frequency. The ratio of their lengths isA. `1:2`B. `2:1`C. `2:3`D. `4:3`
• Thw two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?A. `20 Hz`B. `30 Hz`C. `40 Hz`D. `10 Hz`
• The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe isA. `13.2 cm`B. `8 cm`C. `12.5 cm`D. `16 cm`