Physical Science 1.23: 6.3 Applications of Waves

Multiple Choice

What is the function of an antenna in a radio?

• Receives radio waves and converts them to electrical energy

• Selects a specific frequency the user wants to hear

• Converts the electrical energy into sound waves

Multiple Choice

When you use Wi-Fi to watch a video on your computer, which of the following is the first step for the video to get to you?

• Your computer converts information into electrical signals that it uses to play the video.

• The information is received by a Wi-Fi antenna in your computer.

• The information in the video is encoded in infrared waves that are sent through a fiber-optic cable.

• The information reaches your router and is converted to EM waves of a different frequency.

Multiple Choice

Which type of scanner collects information by reflected red light waves?

• Barcode scanner

• Baggage security

• Computer scanner

Multiple Choice

Which model shows why the Doppler effect causes the pitch of a sound to seem lower to an observer?

• A

• B

Multiple Select

Which of the following statements describes an analog wave? (Check all that apply)

• The signal moves instantly between a limited number of values.

• The signal moves gradually among an infinite number of values.

• People hear sound waves coming from an orchestra.

• Data are stored on computers.

Multiple Choice

What would be the first step when a digital photo is taken and stored?

• Visible light waves enter the camera and strike the detector.

• Each pixel records the color and brightness of the light it receives as an electrical signal.

• The code is stored by transistors as 1s and 0s based on whether each transistor has been set to "on" or "off".

• The electrical signals are converted to a binary code of 1s and 0s.

Multiple Select

Which of the following statements would be an advantage of storing data digitally? (Check all that apply)

• The quality of copies does not decrease as more copies are made.

• It is easy to copy a computer virus to a device.

• Other people can access data that you don't want them to see.

• The parts of devices that store data are stable.

Multiple Choice

In digital data, 1s and 0s are represented by __________ amplitudes or frequencies.

• Continuously varying

• High or low