The image shows water waves approaching the boundary between an area of slower speed and an area of higher speed. The boundary is marked by a dashed line. The original direction of the wave is shown by the arrow on the left. What will happen to the wavelength and direction of the wave as it crosses the boundary? Wave approaching boundary
A. The wavelength increases and the waves follow arrow 1.
B. The wavelength decreases and the waves follow arrow 1.
C. The wavelength increases and the waves follow arrow 2.
D. The wavelength decreases and the waves follow arrow 2.

Sound wavelength of visible light waves

Dust and gases contract.

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.