EM WAVES
Given that all EM waves travel in vacuum, which EM wave travels the fastest?
They all have the same speed.
Which type of electromagnetic wave is produced by a vibrating antenna?
Radio wave
Welders usually wear helmet, gloves, goggles and other protective clothing which is used to protect the welder from what type of EM wave?
Ultraviolet
In a mirror diagram, what do we call to the imaginary line that can be drawn perpendicular to the surface of the mirror and used as reference point in determining the angle of reflection and incidence?
Normal Line
If a person is experiencing MYOPIA or nearsightedness, what type of lens should he/she use?
Concave Lens
These are waves that DOES NOT REQUIRE a medium to transfer energy.
Electromagnetic waves
When the wavelength of a wave doubles, this property of the wave is reduced to half its original value.
Frequency
Among the types of EM waves, which are classified as IONIZING RADIATION?
Xrays and Gamma Rays
What type of mirror can produce real and virtual image?
Concave Mirror
Periscope is an instrument used for observation. For it to properly work, its mirrors should be positioned at what angle?
45 degrees
What device did Hans Christian Oersted use to prove that a current-carrying wire creates a magnetic field?
Compass
What type of EM wave is used on Night vision goggles?
Infrared
Which type of electromagnetic wave is classified as a carcinogen by both the World Health Organization (WHO) and the United States government?
Xrays
Assuming that an image is place exactly at the focus or focal point, what are the characteristic of the image formed?
No image is formed
These type of lenses are also known as converging lenses.
Convex Lens
Which EM wave lies beyond the red end of Visible Light?
Infrared
Kathleen works as a cashier in a busy supermarket. One afternoon, a customer hands her a crisp 1000-peso bill. As Kathleen inspects it, she becomes unsure whether the bill is genuine or counterfeit. She wants to verify its authenticity before accepting it.
Which EM wave would Kathleen use to take to check if the 1000-peso bill is fake?
Ultraviolet
What type of radiation does not have enough energy to remove an electron (negative particle) from an atom or molecule?
Non-Ionizing Radiation
What characteristic of a plane mirror is applied in a way the word AMBULANCE is written?
Lateral Reversion/ Laterally Reversed/Lateral Inversion
Sidemirrors makes use of what type of mirror?
Convex Mirror
An EM wave has a frequency of 2.99 Hz. If the given wave travels in vacuum, what is its wavelength?
1.00 x 108 m
Explain how a microwave heats food.
A microwave heats food by causing water molecules to vibrate rapidly through microwave radiation, generating heat that warms the food evenly.
UVA = Aging rays (longest wavelength, causes skin aging)
UVB = Burning rays (causes sunburn and skin cancer)
UVC = Cleansing rays (most dangerous but absorbed by the ozone layer)
If you are standing infront of a convex mirrror, describe the LOST of the image produced.
Erect
Reduced
Virtual
A dentist uses a concave mirror to examine a patient’s teeth. What is the main reason for using this type of mirror instead of a flat one?
It produces an upright and magnified image for better viewing.