EM Waves

An electromagnetic wave in a vacuum has a wavelength of 0.07m. What is its frequency?

• f= 3.0x 10^8 m/s

• f= 3.0x 10^9Hz

• f=4.3x 10^9Hz

• f=4.3x 10^8m/s

Infrared rays have a shorter wavelength than

• Ultraviolet ray.

• X-rays.

• radar waves.

• gamma rays

Which of the following occurs as a light wave bends when it passes from one medium into another?

• constructive interference

• refraction

• destructive interference

• reflection

How are Electromagnetic waves different from Mechanical waves?

• EM waves have very short wavelengths

• EM waves transmit energy instead of matter

• EM waves can travel through the vacuum of space

• EM waves can change direction by reflection

Which of the following electromagnetic waves has the lowest frequency?

• gamma ray

• infrared wave

• visible light wave

• microwave

All electromagnetic waves are...

• transverse waves and have the same frequency

• transverse waves and have the same speed in a vacuum

• mechanical waves and have the same wavelength

• longitudinal waves and have the same energy

Which of the following are true of electromagnetic waves?

• They all travel at the same speed in a vacuum

• They need a medium to travel

• Only a small portion of them are visible to humans

• They all carry the same amount of energy

In the diagram, which letter represents the angle of incidence?

• A

• B

• C

• D

Which diagram represents regular (specular) reflection?

• A

• B

Law of reflection state that - The angle of incidence is .................. to the angle of reflection.

• equal
• double
• half