Question

examine the chart that lists several statements regarding cell phone use of radio signals for transferring information.

1. cell phones transfer and receive radio signals without a medium.
2. radio signals transferred through cell phones carry large amounts of data.
3. cell phones transfer information without using a transmitter and a receiver.
4. the data transferred through cell phones using radio signals can be stored and recorded.

which statements are true regarding cell phone use of radio signals?
○ 2 and 4 only
○ 2, 3, and 4
○ 1, 2, and 4
○ 1 and 3 only

Explanation:

• Statement 1: Cell phones need a medium (air as a medium for radio - wave propagation) to transfer and receive radio signals. So, statement 1 is false.
• Statement 2: Radio signals carry large amounts of data. This is a fundamental property of radio - wave communication used in cell phones. So, statement 2 is true.
• Statement 3: Cell phones use both a transmitter (to send information) and a receiver (to get information). So, statement 3 is false.
• Statement 4: The data (voice, text, etc.) transferred through cell phones using radio signals can be stored (e.g., in memory) and recorded (e.g., call recordings). So, statement 4 is true.

Answer:

2, 4 and 4 (the option “2, 3 and 4” is incorrect, the correct option should be “2 and 4 only” but since the given options have “2, 3 and 4” as one of the choices, there might be a mis - print in the problem. Assuming we go by the analysis of statements 2 and 4 being correct, if we consider the given options, the closest is “2 and 4 only” which is not in the provided options. But if we assume a typo in the problem's options and the intended option was “2 and 4 only” then that is the answer. If we strictly go by the given options and the analysis (statements 2 and 4 correct), and the options have “2 and 4 only” as one of the choices (the third option in the left - hand side of the image is “2 and 4 only”), then the answer is “2 and 4 only”.)