7P10.1 Electromagnetic Spectrum & their Uses

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

• Shorter wavelengths have lower frequencies.

• Shorter wavelengths have higher frequencies.

• Longer wavelengths have higher frequencies.

• Wavelength and frequency are not related.

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What is one of the primary uses of gamma radiation?

• Medical imaging

• Transmitting mobile phone signals

• Sterilizing surgical instruments

• Television remote controls

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Why are X-rays suitable for medical imaging?

• They can be seen and felt.

• They mostly pass through skin and soft tissue but not bone or metal.

• They easily pass through bone and metal.

• They have the longest wavelengths.

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What natural source emits ultraviolet radiation?

• Microwave ovens

• Radio stations

• Television remote controls

• Sunlight

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Which color in the visible spectrum has the shortest wavelength?

• Violet

• Red

• Green

• Blue

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What type of radiation is absorbed by the skin and felt as heat?

• Gamma radiation

• X-rays

• Infrared radiation

• Ultraviolet radiation

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How does microwave radiation heat food in a microwave oven?

• By reflecting off the food

• By passing through the food

• By emitting visible light

• By being absorbed by water in the food

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What is one use of microwave radiation besides heating food?

• Transmitting mobile phone signals

• Security pens

• Sterilizing surgical instruments

• Medical imaging

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Which type of radiation has the longest wavelength?

• Gamma radiation

• X-rays

• Microwaves

• Radio waves

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How can some radio transmissions be sent around the world without satellites?

• By passing through the Earth's core

• By being reflected off the ionosphere

• By being absorbed by water in the atmosphere

• By using ultraviolet radiation

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