Challenge Week Final Assessment 23-24

Front

What is the principle behind Maglev trains?

Back

Maglev trains use the principle of magnetic repulsion, where similar magnetic poles repel each other, causing the train to levitate above the tracks.

Front

What happens when you rub a balloon on your head?

Back

The balloon becomes negatively charged due to the transfer of electrons from your hair to the balloon.

Front

What type of electromagnetic wave is used in television technology?

Back

Radio waves are the type of electromagnetic wave that made TV technology possible.

Front

What occurs when the sun heats a puddle of water?

Back

The water evaporates as it absorbs heat energy from the sun.

Front

Why is low-frequency red light used in dark rooms?

Back

Low-frequency red light has low energy, which does not expose photographic film.

Front

What is the effect of magnetic fields on Maglev trains?

Back

Magnetic fields repel each other, allowing the train to hover and travel at high speeds.

Front

What attracts a negatively charged balloon?

Back

A negatively charged balloon is most attracted to positively charged objects, such as hair.

Front

What is the relationship between frequency and energy in electromagnetic waves?

Back

Higher frequency electromagnetic waves have higher energy, while lower frequency waves have lower energy.

Front

What is evaporation?

Back

Evaporation is the process where liquid water turns into vapor when heated.

Front

What is the significance of radio waves in communication?

Back

Radio waves are used for transmitting signals in various forms of communication, including television and radio.