Electromagnetic Waves Summative Test

AccomplishedHurdyGurdy avatar
AccomplishedHurdyGurdy
·

Start Quiz

Study Flashcards

30 Questions

Why are electromagnetic waves like ultraviolet rays, X-rays, and gamma rays harmful to living things?

They possess greater energy that they can kill living cells.

Which of the following is a useful application of infrared radiation to humans?

They can show temperature variations of the body.

Which of the following is TRUE about infrared radiation and UV radiation?

Infrared radiation has a longer wavelength than UV radiation.

The following are useful applications of Ultraviolet Radiation EXCEPT

over-exposure posed damages to surface cells and eyes and can cause cancer

Which of the following refers to the number of oscillations or wave per unit time and is measured in Hertz (Hz)?

Frequency

What wave property can best explain the apparent bending of a pencil when it is dipped into a glass of water?

Refraction

When the object is at the center of curvature, the image formed is

Same size as the object

A ray through the center of curvature is reflected at

Principal axis

Which of the following uses total internal reflection?

Fiber optics

What happens to a light ray as it passes from one medium to another medium?

It will refract

A wave with a shorter wavelength must have a higher frequency, and vice versa.

True

Which of the following EM waves has the highest energy, greatest frequency, and shortest wavelength?

Gamma ray

What kind of lens should a person with myopia use?

Concave lens

What image is formed in a concave mirror when the object is at the focal point?

No image

What is the angle at which a ray of light is reflected from a mirror when it falls on it at an angle of 20° with the surface?

40°

What is a useful application of infrared radiation to humans?

They can show temperature variations of the body.

Why are electromagnetic waves like ultraviolet rays, X-rays, and gamma rays harmful to living things?

They possess greater energy that they can kill living cells.

Which statement is TRUE about infrared radiation and UV radiation?

Infrared radiation has a longer wavelength than UV radiation.

Which of the following is NOT a useful application of Ultraviolet Radiation?

Over-exposure poses damages to surface cells and eyes and can cause cancer

What refers to the number of oscillations or wave per unit time and is measured in Hertz (Hz)?

Frequency

What is the term for the maximum displacement of a wave from its rest position?

Amplitude

Which of the following is a source of electromagnetic waves?

All of these

What kind of lens should a person with myopia use?

Concave lens

What happens to a light ray as it passes from one medium to another medium?

It will refract

Which wave property can best explain the apparent bending of a pencil when it is dipped into a glass of water?

Refraction

When the object is between the focal point and mirror, the image formed is:

Virtual

What image is formed in a concave mirror when the object is at the focal point?

No image

Which of the following uses total internal reflection?

Fiber optics

A dentist uses a mirror to enlarge the image of a tooth to have a better view of cavity formations. What type of mirror does the dentist most likely use?

Concave mirror

Which of the following refers to the number of oscillations or waves per unit time and is measured in Hertz (Hz)?

Frequency

Study Notes

Electromagnetic Waves

  • Electromagnetic waves like ultraviolet rays, X-rays, and gamma rays are harmful to living things due to their high energy and frequency, which can cause damage to cells and tissues.
  • Infrared radiation has a useful application in heating and warming, such as in heating pads and night vision devices.
  • Infrared radiation has a lower energy and frequency than UV radiation.

Light Waves

  • Frequency refers to the number of oscillations or wave per unit time, measured in Hertz (Hz).
  • Wavelength and frequency are inversely proportional: a shorter wavelength means a higher frequency, and vice versa.
  • Gamma rays have the highest energy, greatest frequency, and shortest wavelength among electromagnetic waves.

Mirrors and Lenses

  • A ray through the center of curvature is reflected at the same angle as the incident ray.
  • When the object is at the center of curvature, the image formed is real and inverted.
  • A concave mirror forms a real and inverted image when the object is at the focal point.
  • A person with myopia should use a concave lens to correct their vision.

Reflection and Refraction

  • The apparent bending of a pencil when dipped into a glass of water can be explained by the wave property of refraction.
  • When a light ray passes from one medium to another, it changes direction due to refraction.
  • Total internal reflection is used in fiber optic communication.

Applications of Electromagnetic Waves

  • Ultraviolet radiation has useful applications in disinfection, water purification, and cancer treatment.
  • Infrared radiation is used in heating pads, night vision devices, and remote controls.
  • A dentist uses a concave mirror to enlarge the image of a tooth to have a better view of cavity formations.

Test your knowledge on electromagnetic waves with this multiple-choice summative test. The test covers topics such as the useful applications of infrared radiation to humans and the harmful effects of electromagnetic waves like ultraviolet rays, X-rays, and gamma rays.

Make Your Own Quizzes and Flashcards

Convert your notes into interactive study material.

Get started for free

More Quizzes Like This

Use Quizgecko on...
Browser
Browser