Question text
1 Which statement about electromagnetic waves is correct? A All electromagnetic waves have speeds in air of approximately 3 × 108m/s. B In air, some electromagnetic waves travel faster than light. C The electromagnetic waves with the largest wavelength are in the infra-red region. D The electromagnetic waves with the smallest wavelength are in the X-ray region.
1 Which statement about electromagnetic waves is correct?
A All electromagnetic waves have speeds in air of approximately 3 × 108m/s.
B In air, some electromagnetic waves travel faster than light.
C The electromagnetic waves with the largest wavelength are in the infra-red region.
D The electromagnetic waves with the smallest wavelength are in the X-ray region.
Select your answer: