Waves on String/in Air
What is the term for the length of one full cycle of a wave?
Wavelength
When a ray of light is incident on a mirror, the mirror __________ the ray of light.
Reflects
When a light ray is incident on a lens, the lens _________ the light ray.
Refracts
What happens to light as it travels through one medium into a different medium?
It refracts (bends)
What is the range of wavelengths for visible light?
400 to 750 nm
Two students, 7 m apart, are holding a stretched, coiled spring between them. One student sends a pulse down the string, and they observe it takes 10.5 s for the pulse to go from one end of the spring to the other, and then back to its starting point. What is the speed of the pulse on the spring?
1.333 m/s
For a plane (flat) mirror, when a ray of light hits the mirror at some angle, the angle of reflection is ...
equal to the angle of incidence (angle that the light ray comes in at to the normal)
For a convex lens, if an object is placed past the focal length of the lens, is the image produced real or virtual? Flipped or right side up?
Real, Flipped
A block of amber is placed in water and a laser beam travels from the water through the amber. The angle of incidence is 35°while the angle of refraction is 24°. What is the index of refraction of amber?
1.87
Which color of visible light refracts the most due to its higher frequency?
What is the wavelength of this standing wave?
48/5 m or 9.6 m
For a concave mirror, if an object is placed past the focal length of the mirror is the image real or virtual? Right side up or flipped?
Real, Flipped
Virtual, Right side up
If the angle of incidence of light traveling through air, striking water, is 30 degrees, what is the angle of refraction?
22.08 degrees
What is the wavelength of radiation with a frequency of 6.24 x l013 sec-1? The speed of light is 3 x 108 m/s.
4.8 x 10-6 m
What is the wavelength of an “E” note which has a frequency of 329.63 Hz? The speed of sound is 343 m/s.
1.04 m
For a convex mirror, if an object is placed further than the focal length of the mirror, is the image produced right side up or flipped? Real or Virtual?
Right side up, Virtual
A convex lens has a focal length of 12 cm. If an object is placed 24 cm away from the lens, how far is the image produced from the lens?
24 cm on the other side.
If the index of refraction for a certain glass is 1.50, and the angle of refraction is 15 degrees for a ray of light traveling from air, what is the angle of incidence?
22.8 degrees
A television relay transmitter operates at a frequency of 927.9 MHz. (1 MHz = 1,000,000 Hz.) Calculate the wavelength of the signal in meters. Is this light we can see?
wavelength = 0.323 m
No, this is not light we can see. It is TV or FM Radio Waves.
What is the length of a straw (tube open on both ends) needed to produce an “A” note which has a frequency of 440 Hz? The speed of sound in the tube is 343 m/s.
0.389 m
A concave mirror has a focal length of 10.2 cm. If an object is placed 40 cm from the lens, where is the location of the image produced?
13.7 cm
A convex lens has a focal length of 22 cm. If an object is placed at 35 cm from the lens, how far away is the image produced from the lens?
59.2 cm
If the incoming angle from the air is 20o from the normal, what is the angle the light ray exits the layer of water?
20 degrees
The color of the sky results from the scattering of sunlight by air molecules. The scattered light has a frequency of 7.5 x1014 Hz. What is the wavelength in nanometers? (1 nm = 10-9 m). What color is this light?
400 nm and this is violet light or indigo.