OCR 21st Century Physics P1 Radiation and Waves

Which of the following is the correct use of Microwaves in the electromagnetic spectrum?

• Sun beds

• Cooking food

• Sterilising surgical instruments

• Looking for broken bones

Which of the following is the correct use of Ultraviolet in the electromagnetic spectrum?

• Sun beds

• Cooking food

• Sterilizing surgical instruments

• Looking for broken bones

Which of the following is the correct use of X-rays in the electromagnetic spectrum?

• Sun beds

• Cooking food

• Sterilising surgical instruments

• Looking for broken bones

Which of the following is the correct use of Gamma rays in the electromagnetic spectrum?

• Sun beds

• Cooking food

• Sterilising surgical instruments

• Looking for broken bones

Fill in the blank.

The human eye can detect a ________ range of frequencies of electromagnetic radiation

• wide

• varied

• narrow

Complete the description of light. Use words from the list.

When light is emitted by a ........................, it transfers ....................... and the eye absorbs it.

• charge

  detector

• source

  energy

• charge

  energy

• source

  charge

Every object emits electromagnetic radiation with different frequencies. Some examples are given in the table.

Put the frequencies in order of energy, from lowest to highest.

• 1) The Earth

  2) The Sun

  3) Red hot barbecue

• 1) The Sun

  2) The Earth

  3) Red hot barbecue

• 1) Red hot barbecue

  2) The Earth

  3) The Sun

• 1) The Earth

  2) Red hot Barbecue

  3) The Sun

What happens to the wavelength emitted from an object as its temperature increases?

• The wavelength decreases.

• The wavelength increases.

• The wavelength stays the same

Earth emits infrared radiation with a typical wavelength of 10μm (10 micrometers). State the number of micrometres in 1 metre.

How many times larger is 1mm than 10μm?

• 10

• 100

• 1000

• 1 000 000