Mathematical and Physical Journal
for High Schools
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# Problem P. 4286. (November 2010)

P. 4286. Waves are generated from a wave source, (the phase angle is zero when they are started.) and they travel along a straight line at a speed of 1 m/s. When a point, in the wave, has zero displacement, the closest point which has the maximim displacement is at a distance of 1 m.

a) Find the wavelength and the frequency.

b) What is the distance between those points whose phase difference is 270o?

c) Measured from the initiation of the waves, when will the phase of the point 5 m from the wave-source first be 180o?

(3 pont)

Deadline expired on December 10, 2010.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. $\displaystyle a)$ A hullámhossz 4 m, a frekvencia 0,25 Hz;

$\displaystyle b)$ 1 méternyire;

$\displaystyle c)$ 7 másodperc múlva.

### Statistics:

 124 students sent a solution. 2 points: Alföldi Kristóf, Buti Gábor, Csahóczi 222 Márton, Fodor Jenő, Gróf Gábor, Halász Dániel, Németh Dániel, Papp Csaba Viktor, Sebők Zita, Terjék Tamás, Tóth 744 András. 1 point: 101 students. 0 point: 7 students. Unfair, not evaluated: 5 solutions.

Problems in Physics of KöMaL, November 2010