Post-Test Radio Waves

What did Heinrich Hertz's experiment prove?

• Sound waves can travel through space.

• Light cannot travel in a vacuum.

• Electromagnetic waves exist and can travel through space.

• Radio waves need air to propagate.

In Hertz's experiment, what component produced the radio pulses?

• Loop antenna

• Spark gap

• Battery

• Vacuum tube

How did Hertz detect the presence of electromagnetic waves?

• By using a voltmeter

• By measuring air pressure changes

• By observing sparks in a secondary loop

• By using a microphone to detect sound

What happens in Hertz's setup when a spark is created in the transmitter?

• A radio wave is absorbed by the spark gap.

• The receiver detects a radio pulse through an induced spark.

• The energy is completely lost in the air.

• A sound wave travels to the receiver.

What was the primary significance of Hertz's experiment?

• It led directly to the invention of cell phones.

• It confirmed Maxwell's theory of electromagnetic waves.

• It showed that electricity and magnetism are unrelated.

• It proved that light cannot travel in a vacuum.

In the demonstration using a lighter igniter, what acts as the spark gap?

• LED bulb

• The igniter and two metal electrodes

• A battery and a wire

• A magnet and a coil

Why is a metal loop or coil used as the receiver in the demonstration?

• To amplify sound signals

• To generate a magnetic field

• To detect radio waves through induced current

• To measure temperature changes

What is the role of the neon bulb or LED in the receiver circuit?

• It absorbs radio waves.

• It generates radio pulses.

• It converts radio waves into visible signals.

• It stores electrical energy.

If no signal is detected in the demonstration, what could be a possible reason?

• The lighter igniter is producing too much energy.

• The receiver loop is placed too close to the spark gap.

• The spark is too weak to generate detectable waves.

• The neon bulb is producing its own light.

How does Hertz's experiment relate to modern technology?

• It helped develop electromagnetic wave applications such as radio and WiFi.

• It proved that light travels only in straight lines.

• It showed that electromagnetic waves require a medium.

• It led to the discovery of nuclear energy.