Suppose that the mirror is moved so that the tree is between the focus point F and the mirror. What happens to the image of the tree? (1 point)
The image moves behind the curved mirror.
The image appears shorter and on the same side of the mirror.
The image stays the same.
The image appears taller and on the same side of the mirror.
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The correct answer is: The image appears taller and on the same side of the mirror.
The correct answer is: Light bends due to the difference in the speed of light in air and glass.
The correct answer is: Light waves do not require a medium to propagate.
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The correct answer is: The frequency of blue light is greater than that of yellow light, while the speeds of both colors of light are the same.
The wavelength of the stationary source is 11.25 ft and the perceived wavelength for the person in the car is 9.25 ft.
Explanation:
The wavelength of a sound wave can be calculated by dividing the speed of sound by its frequency.
For the stationary sound source: wavelength = speed of sound / frequency = 1125 ft/s / 100 Hz = 11.25 ft
For the person in the car, we need to use the concept of Doppler effect. Due to the motion of the car towards the sound source, the frequency of the sound heard by the person will be higher. The perceived frequency can be calculated by:
perceived frequency = (speed of sound + speed of car)/(speed of sound) x actual frequency
perceived frequency = (1125 + 200) / 1125 x 100 = 118.52 Hz
Now, we can calculate the perceived wavelength as:
perceived wavelength = speed of sound / perceived frequency = 1125 ft/s / 118.52 Hz = 9.25 ft
Therefore, the answer is: wavelength of the stationary source is 11.25 ft; perceived wavelength: 9.25 ft.
As a wave travels from one spring to another spring with a different mass, its wavelength decreases by 25%. Which statement describes the change in the speed of the wave?(1 point)
Responses
The speed increases by 25% because speed and wavelength are directly proportional.
The speed decreases by 25% because speed and wavelength are directly proportional.
The speed increases by 25% because speed and wavelength are inversely proportional.
The correct answer is: The speed decreases by 25% because speed and wavelength are inversely proportional.
Explanation:
The speed of a wave is directly proportional to the frequency and inversely proportional to the wavelength.
v = fλ, where v is speed, f is frequency, and λ is wavelength.
If the wavelength of the wave decreases, the frequency must increase in order to maintain a constant speed. However, no information is given about the frequency of the wave in this problem.
Therefore, the only correct answer is that the speed of the wave decreases by 25%, since wavelength and speed are inversely proportional.
The correct answer is: 1s and 0s.
Explanation:
Digital transmissions represent data as discrete 1s and 0s, whereas analog transmissions represent data as continuous, varying electric signals such as sine waves.
In digital communication systems, data is converted into digital signals which typically employ the binary numeral system where elements are represented by either 0 or 1. This allows for accurate representation of data across communication networks and devices.
On the other hand, in analog communication systems, data is represented as continuous signals that vary with time, which poses limitations in terms of efficient transmission and accuracy.
Therefore, the term "1s and 0s" is specific to digital communications and not relevant to analog transmissions.
Why might someone choose to use film, rather than digital methods, for photography?(1 point)
Digital images are more difficult to share.
Some film methods allow you to print a picture from anywhere without electricity.
Film allows you to study a picture immediately.
Digital photographs are more difficult to store in large quantities.