Nature of Light

Light waves are

• Mechanical

• Longitudinal

• Electromagnetic

• All of these

The highest point on a light wave

• trough

• amplitude

• crest

• wavelength

Material that allows light to pass through allowing you to see 'clearly' to the other side

• opaque

• translucent

• transparent

Electromagnetic radiation travels through a vacuum at a speed of

• 186,000 m/s

• 125 m/s

• 3.00 x 10^8 m/s

• It depends on the wavelength

What is the phase difference between electric and magnetic fields in a light wave?

• (a) 0

• (b) π

• (c) π/2

• (d) π/4

The ratio of the speed of light in vacuum to its speed in a specific medium

• 1. Magnification produced by lens

• 1. Magnification produced by mirror

• 1. Refractive index of that medium

• 1. None of the above

What is the speed of light in a vacuum?

• 299,792,458 km/s

• 299,792,458 m/s

• 299,792,458 ft/s

• 299,792,458 mph

What type of electromagnetic radiation has the longest wavelength?

• Gamma rays

• X-rays

• Ultraviolet

• Radio waves

How does the speed of light change when it travels from vacuum to a medium?

• A. It remains constant  

• B. It increases 

• C. It decreases 

• D. It fluctuates

Light is a good example of

•  A .Luminous objects

• B. Non-luminous objects

• C. Transparent objects

• D.Opaque objects