B. when a wave meets a boundary, the angle of the reflected wave is equal to the angle of the incident wave
Wave A has an amplitude of 2, and wave B has an amplitude of 2. What will happen when the crest of wave A meets the trough of wave B?
D. They will interfere to create a crest with an amplitude of 0
Select all that apply.
There is no sound in the vacuum of space. Why?
D. Sound must travel through something that vibrates.
C. There is no air to vibrate the human eardrum.
How long would it take for a sound impulse to travel through a copper rod 25 kilometers long?
B. 7.1 sec
Sound will travel fastest in air at _____.
A bumblebee buzzes past you at 3 m/s. The frequency of the hum made by its wings is 152 Hz. Assume the speed of sound to be 342 m/s. What is the observed frequency of the hum as the bumblebee approaches you?
D. 153 Hz
You are standing at position X. Click on the diagram that shows your position when you perceive a sound higher than the actual pitch of the siren.
A, B, or C?
An "F" tuning fork with a frequency of 349 Hz is used to test the "F" note of a piano. Three beats are heard. This means the piano key is _____.
A. out of tune and has a frequency of either 346 or 352 Hz
If the fundamental frequency of a musical instrument is 22 Hz, what is the frequency of the second harmonic?
D. 44 Hz
Nearly all light that strikes a(n) _________ object will pass through it
A object is placed in front of a convex mirror. The image that forms is _______.
An object is positioned in front of the focal point of a concave mirror. Choose the ray diagram that shows the proper positioning of the image.
A or B?
White light is shining on a green grape. The grape _____.
D. reflects green light
A _______ lens is used in a magnifying glass.
The object distance for a concave lens is 8.0 cm, and the image distance is 12.0 cm. The height of the object is 4.0 cm. What is the height of the image?