Let's break down your questions one by one.
Question 1: In this question, we want to identify which part of a transverse wave helps us determine the wave frequency.
- A. Crest: The highest point of the wave.
- B. Trough: The lowest point of the wave.
- C. Wavelength: The distance between two consecutive crests or troughs.
- D. Amplitude: The height of the wave from the midpoint to the crest or trough.
To determine frequency, we often look to the wavelength (C) since frequency is inversely proportional to wavelength (as per the equation \( f = \frac{v}{\lambda} \), where \( f \) is frequency, \( v \) is wave speed, and \( \lambda \) is wavelength).
Thus, the correct answer is C. wavelength.
Question 2: This question involves understanding the relationship between wavelength, frequency, and energy in the context of the electromagnetic spectrum.
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A. Wavelength and wave energy decrease as frequency increases. This statement is incorrect as it doesn't clearly represent the relationship.
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B. As wavelength decreases, frequency and wave energy increase. This is correct, as shorter wavelengths correspond to higher frequencies and higher energy (E = hf).
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C. There is a direct relationship between wavelength, frequency, and wave energy. This statement is misleading, as the relationship is actually inversely proportional for wavelength and frequency.
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D. As wavelength increases, frequency decreases while energy remains constant. This is incorrect because energy changes with frequency.
Therefore, the correct response is B. As wavelength decreases, frequency and wave energy increase.
If you have any further questions or need additional explanations, feel free to ask!
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