Motion Relative to the Earth Physics Notes - Edubirdie

University:
University of Cambridge
Course:
0625 IGCSE | Physics
Academic year:

2023
Views:

345

Pages:

2
Author:

Deddy A.

CASE 3 Both Source and Observer in Motion Relative to the Earth fo=fo (u+v) vo Doppler Radar Approaching Reflection is Higher Frequency Radar Transmit Frequency Receding Reflection is Lower Frequency When the observer moves toward the source, a positive speed is substituted for vo; when the observer moves away from the source, a nega- tive speed is substituted for vo. Similarly, a positive speed is substituted for us when the source moves toward the observer, a negative speed when the source moves away from the observer. Interference of Sound Waves O, or some integers. 72-11 = πλ (η = 0, 1, 2..) Constructive Interference. A sound wave from the speaker (S) enters the tube and splits into two parts at point P. Path length path length, 12-71=(1+2) (n = 0,1,2..) Destructive Interference if one is path is longer/shorter than the other →waves cancel out no sound detected by observer! reuniting of the sounds produces constructive. interference Path length r The two waves combine at the opposite side and are detected at the receiver (R). Standing Waves Sum of incident and reflected waves with wavelengths determined by the conditions at both ends 1-7/8 N = node where net displacement is zero A = antinode where net displacement is maximized 1 distance betw. 2 adj nodes πλα 2 2 x of the wave L (ends fixed) L=X Ye wave #all points on string have same freq., but diff. Amplitudes Figure 14.18 Astanding-wave pat- tern in a stretched string, shown by snapshots of the string during one- half of a cycle. In part (a) N denotes a node.

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