Module 9 Lesson 1 Introduction to Waves

Which part of a longitudinal wave has the lowest density? (纵波中最稀疏的部分，称之为？）

• rarefaction

• refraction

• fraction

• compression

What is half the vertical distance from the crest to the trough of a transverse wave? (横波中，波峰到波谷垂直距离的一半，称之为？）

• frequency

• amplitude

• wavelength

• period

What can be measured by Hz?

• Energy

• Amplitude

• Frequency

• Speed of wave

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Which do waves transfer?

• matter

• energy

• matter and energy

• the medium

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what is the formula for calculating wave speed?

• v=fλ

• v=f/λ

• v=f-λ

• v=λ+f

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when a longitudinal wave travels through a medium, in which direction does the matter in the medium move? (纵波通过介质传播时，介质中的物质运动方向是？）

• in circles

• perpendicular to the rest position 垂直于波的运动方向

• along the same direction the wave travels 沿着波运动的相同方向

• in all directions

Use the figure to answer question:

What is region X on the wave called?

• crest

• compression

• rarefaction

• trough

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If the frequency of a vibrating object decreases, how does the wavelength of the resulting wave change?

• It stays the same.

• It decreases.

• It vibrates.

• It increases.

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Calculate wave speed. The microwaves produced inside a microwave oven have a wavelength of 12cm and a frequency of 2,500,000,000 Hz. At what speed (in m/s) do the microwaves travel?

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Calculate Frequency Water waves on a lake travel toward a dock(码头) with a speed of 2.0 m/s and a wavelength of 0.5 m. How many wave crests strike the dock each second? (注意单位)

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