Лабораторные работы / Решенная лабораторная по физике 12

The laboratory work N^o 10.

Definition of a sound velocity by the method of wave interference

Have done by the student gr.__220473я__ F.N.S. Pavlov F.E.

Checked by ______________________ date ____________

Purpose: study an interference phenomenon by sound waves and it’s application for the defining of sound velocity in the air

In this work I must draw a dependence graph of x_n on the number of maximum n.

N	Sound frequency, h
	2000		2500		3000
	xn, mm	n xn, mm	xn, mm	n xn, mm	xn, mm	n xn, mm
1	43	43	9	9	52	52
2	131	262	75	150	110	220
3	220	660	144	432	174	522
4	309	1236	218	872	225	1020
5	402	2010	289	1445	283	1415
6	492	2952	357	2412	343	2058
7	580	4060	425	2975	405	2835
Sum	2177	11223	1549	8295	1592	8122

The wavelength is following:

₁ = 0.1856 m; ₂ = 0.1499 m; ₃ = 0.1252 m;

F or a calculation the wavelength I used the following formula

The sound velocity is equaled to V= . V₁ = 371.2 m/s; V₂ = 374.5 m/s; V₃ = 375.6 m/s;

Thus, <V> = 373.6 m/s.

Conclusion: so we have studied an interference phenomenon by sound waves and it’s application for the defining of sound velocity in the air