Using the wave equation
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Question 1 of 6
1. Question
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A sound wave moving through a fluid has a wavelength of 300 cm and a frequency of 140 Hz. What is the speed of this wave in m/s? Give the exact answer.
Answer: m/s
Correct 1 / 1 PointsIncorrect / 1 PointsHint
Remember to convert from cm to metres first! The formula is v = f λ
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Question 2 of 6
2. Question
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A sound wave has a speed of 330 m/s and a wavelength of 8 * 10-1 m. What is the frequency of this wave in Hertz? Enter your answer exactly.
Answer: Hertz
Correct 1 / 1 PointsIncorrect / 1 Points -
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Question 3 of 6
3. Question
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The picture below shows the frequency rating of a microwave. You can check the back of your own microwave for this. The frequency is 2450 MHz, or 2.45 * 109Hz.
Ori tried to measure the wavelength of microwaves. He put a piece of chocolate in a non-spinning microwave for a short time and noticed two very melted spots. He interpreted these to be the peaks of the microwave. The length between them was 12cm.
Using the frequency and wavelength provided, calculate the speed of light. (All electromagnetic waves, including microwaves, are a type of ‘light’ and therefore travel at the same speed)
Round your answer to two significant figures.
Answer: * 108 m/s
Correct 1 / 1 PointsIncorrect / 1 Points -
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Question 4 of 6
4. Question
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Ceci is on a beach in Costa Rica. She notices that the distance between wave peaks is about 5 m. She also notices that the wave peaks reach the shore every 7 seconds. Help her calculate the speed with which the waves are moving. Enter your answer as a decimal to one sig. fig.
Answer: ms-1
(Confused? See hint)
CorrectIncorrectHint
The time between the peaks is the period. To convert that to frequency, you take its inverse, so 1/10s. Then just apply the v = f λ formula
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Question 5 of 6
5. Question
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As a wave moves from liquid A to liquid B, its speed doubles, while its frequency stays constant. How does the wavelength change? The wavelength [ doubles || halves || does not change ]
(Not sure how to do this? See hint)
Correct 1 / 1 PointsIncorrect / 1 PointsHint
Set frequency to 1, and speed to 2. Plug into the wave speed equation.
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Question 6 of 6
6. Question
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In liquid C, a specific wave has a wavelength of 0.01 m and a speed of 2m/s. The wave then moves to liquid D, in which its wavelength changes to 0.04m. Calculate its new speed. (Assume that the frequency stays constant).
Answer: m/s
(Not sure how to do this? See hint)
Correct 1 / 1 PointsIncorrect / 1 PointsHint
First calculate the wave speed, v, in the first liquid. Then plug that speed into the equation for the second liquid.
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