Why does the frequency of a wave increase as the wavelength decreases?
2 answers:
Answer: The correct answer is " because the wave speed remains constant".
Explanation:
The expression of the wavelength in terms of the frequency is as follows;
Here, c is the speed of the light, f is the frequency of the wave and is the wavelength of the wave.
The wavelength of the wave is inversely proportional to the frequency of the wave as the speed of the wave remains constant.
If the wavelength of the wave decreases then the frequency of the wave increases.
Therefore, the frequency of a wave increases as the wavelength decreases because the wave speed remains constant.
The correct option is (A).
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Answer:
Yes, the car driver is exceeding the given limit.
Explanation:
<u>Given:</u>
- Speed of the car, v = 38.0 m/s.
- Speed limit of the highway,
We know,
1 mi = 1.60934 km.
1 km = 1000 m.
Therefore, 1 mi = 1.60934 × 1000 m = 1609.34 m.
1 hour = 60 minutes.
1 minute = 60 seconds.
Therefore, 1 hour = 60 × 60 seconds = 3600 seconds.
Using these values,
Therefore,
Clearly,
which means, the car driver is exceeding the given speed limit.
Answer:
2.43J
Explanation:
Given parameters:
Mass of the arrow = 0.155kg
Velocity = 31.4m /s
Unknown:
Kinetic energy when it leaves the bow = ?
Solution:
The kinetic energy of a body is the energy in motion of the body;
it can be derived using the expression below:
K.E = m v²
m is the mass
v is the velocity
Solve for K.E;
K.E = x 0.155 x 31.4 = 2.43J