"Unit Error-Prone Intensive Training" Information Transmission PPT

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"Unit Error-Prone Intensive Training" Information Transmission PPT

Common mistake point 1: Not clear about the application of electromagnetic waves

1. There are many electrical appliances used in homes now, such as: ① vacuum cleaners; ② mobile phones; ③ air conditioners; ④ TV remote controls; ⑤ washing machines. Among them, a group of electrical appliances that use electromagnetic waves to work are (C)

A.①② B.③④

C.②④ D.②⑤

2. There are many members of the electromagnetic wave family, including radio waves, infrared rays, visible light, ultraviolet rays, X-rays, γ-rays, etc. Electromagnetic waves are inseparable from people's lives and have penetrated into every aspect of our lives. Regarding the application of electromagnetic waves, which of the following statements is correct (B)

A. The banknote detector uses infrared rays to identify the authenticity of banknotes.

B. Mobile phones use radio waves to transmit signals

C. The remote control uses ultraviolet rays to control the TV

D. Electric kettles work using electromagnetic waves

Common mistake point 2: Confusing the relationship between wave speed, wavelength and frequency

3. The satellite's microwave detector can detect microwave radiation emitted by the "lunar soil" at frequencies of 3.0 GHz, 7.8 GHz, 19.35 GHz and 37.0 GHz. Which of the following statements is correct (A)

A.Microwaves are electromagnetic waves

B. Microwaves are visible light

C. These four types of microwaves have the same wavelength in vacuum

D. These four types of microwaves propagate at different speeds in vacuum

4. The picture shows the electromagnetic wave family. Some types of stars are cooler and appear dark red; others are extremely hot and appear blue. It can be inferred based on the information given (B)

A. The wavelength of infrared light is shorter than the wavelength of blue light

B. Red light has a longer wavelength than gamma rays

C. The higher the temperature of the star, the lower the frequency of the light it emits.

D. Red light propagates faster than radio waves in vacuum

Common mistake point 3: Not clear about the transmission and reception of radio and television

5. As shown in the figure is the schematic diagram of the transmission and reception of the TV. The function of the display in Picture B is to restore the received image electrical signal into an image; the function of the speaker is to convert the audio electrical signal into sound.

6. Wireless radio stations and television stations both use electromagnetic waves to propagate signals. Regarding their differences, which of the following statements is correct (B)

A. Broadcasting stations need transmitting antennas to transmit electromagnetic waves, while TV stations do not need transmitting antennas to transmit electromagnetic waves.

B. Radio stations emit electromagnetic waves with only sound signals, while TV stations emit electromagnetic waves with both sound signals and image signals.

C. The propagation speed of electromagnetic waves emitted by radio stations is smaller than that emitted by TV stations.

D. The frequency of electromagnetic waves emitted by radio stations is higher than that emitted by TV stations.

Common mistake point 4: Not knowing the working principle of the telephone

7. As shown in Figures A and B, they demonstrate the working process of the telephone microphone and receiver respectively. The correct explanation about these two pictures below is (D)

A. Picture A shows the receiver of a telephone, which works based on the principle of electromagnetic induction.

B. Picture A shows the microphone of a telephone, which converts electrical energy into mechanical energy when it works.

C. Picture B shows the handset of a telephone, which works by using the effect of the magnetic field on the current.

D. Picture B shows the microphone of the telephone, which converts mechanical energy into electrical energy when it works.

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Update Time: 2024-09-09

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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