PRE-ASSESSMENT Q2 WK1-2

Scientists that contributed to developing equations that showed the relationship of electricity and magnetism.

• Hans Christian Oersted

• Michael Faraday

• Heinrich Hertz

• James Clerk Maxwell

The person behind the formulation of the principle of electromagnetic induction.

• Hans Christian Oersted

• Michael Faraday

• Heinrich Hertz

• James Clerk Maxwell

Which of the following is not an electromagnetic wave?

• gamma rays

• infrared

• X-ray

• sound

A common property of all waves is the relationship between the speed (v), the wavelength (λ), and the frequency of the wave (f). The correct equation for this relationship is which of the following?

• v = f λ

• v = f/ λ

• f = v λ

• λ = vf

What is the disturbance that transfers energy?

• data

• interference

• signal

• wave

The electromagnetic spectrum shows the complete range of frequencies of electromagnetic waves from the lowest to the highest, including, in order, radio, infrared, visible light, ultraviolet, X-ray, and gamma ray waves. Which of the following statements explains how the electromagnetic waves are produced?

• Electromagnetic waves are produced when energy moves a substance, a material, or a “thing” within a medium that will conduct the mechanical energy of motion away from the source.

• Electromagnetic waves are longitudinal waves that are produced when the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport.

• Electromagnetic waves are transverse waves that can be created by accelerating charges, moving charges back and forth that produce oscillating electric and magnetic fields, and this travel at the speed of light.

• Electromagnetic waves are produced whenever two waves of identical frequency interfere with one another while traveling opposite directions along the same medium.

7. What can electromagnetic waves travel through that mechanical waves cannot travel through?

• air

• vacuum

• water

• wood

8. A certain radio station broadcasts at a frequency of 675 kHz. What is the wavelength of the radio waves?

• 280m

• 324m

• 400m

• 444m

Which description is true about the radio waves in the electromagnetic spectrum?

• It has the shortest wavelength and highest frequency.

• It has the longest wavelength and lowest frequency.

• It has the longest wavelength and higher frequency.

• It has the wavelength and lower frequency.

How do the wavelength, frequency and speed of ultraviolet rays in vacuum compare with those visible light?

• Longer, Higher, Slower

• Longer, Lower, Same

• Same. Lower, Slower

• Shorter, Higher, Same