A sound wave generated by a musical note has the characteristics presented in the table. What is the missing value?
Medium
Wave speed
(m/s)
346
Frequency
(Hz)
Wavelength
(m)
Air
55
?
Glass
5,640
55
102
Aluminum
6,420
55
117
A. 5.4
B. 4.7
C. 6.3
O
D. 7.5

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

What are atoms of the same element with varying number of neutrons

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction