this is my physics homework. i tried doing it but i don\'t know if it is right.

Question

this is my physics homework. i tried doing it but i don't know if it is right. Please correct it if i did it wrong.

12-13: A physics stadent in an argon filled room has a pipe part of which is subemerged in waier. The a student adjust the amount of pipe 0.4 m of the pipe is protruding from the water, the sound of the tuning fork becomes louder for protruding from the water and hoilds a 500 Hz tuning fork near the opening the first time 12. What is the speed of sound in the argoo filled room? 3)200 m's b) 340 ms c) 625 mys d) 800 m/s 500(04) 13. What is the nest highest leagth of pipe protruding from the water which will caeses the fork to resonate? 500 Hz tuning o ul t) 0.8 m c) 1.2 m 1.6m 14. A 425 Hz tuning fork is held to the shertest length what is the length of the pipe? sext to a pipe which is open at each end. The length of the pipe is adjusted which causes the tuning fork to resonate. If the speed of sound in the room is 340 ms, a) 0.4 m (bi0.8 m c) 1.2 m d) 1.6m 1175 415 15. Which of the following pictures illustrates a longitudinal wave? a) c) b) d) 16. The velocity of a mechanical wave depends on which of the follow ing? a)the mediurn it moves through its b) its wavelength c) its amplitude d)frequeney 17. The energy carried by a mechanical wave depends on which of the folloning? a) its frequency b) its wavelength its amplitude d) the medium it moves through 18. During a class demonstration, a physies teacher causes two tuning forks to ring at the same time. The students in the class hear a "beat" where the resulting sound grows loeder and softer at a regular isterval. Which of the following must be true about the two tuning forks? a) they must have the same frequency b)they must have slightly different frequencies c) they must have frequencies which vary greatly they must have frequencies which are whole number multiples of each other

Explanation / Answer

(12) wavelngth= 4L for pipe closed on one end for first mode of vibration

wavelnegth= 4(0.4)=1.6 m

v= 500(1.6)

v=800 m/s

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