# Electromagnetic Waves Summative Test

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## 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.

### The following are useful applications of Ultraviolet Radiation EXCEPT

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

Frequency

Refraction

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

Same size as the object

Principal axis

Fiber optics

It will refract

True

Gamma ray

Concave lens

No image

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

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

Frequency

Amplitude

All of these

Concave lens

It will refract

Refraction

Virtual

No image

Fiber optics

Concave mirror

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.

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