QUESTION ON RAY-ULTRA VIOLET

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1. Why is Ultra Violet (UV) light able to penetrate and burn skin?

UV has longer wavelenghts.

UV has more energy than visible light.

UV is the same thing as infrared.

UV is a form of radioactivity released by atomic nuclie.

2. What is light amplification by stimulted emission of radiation?

A laser

Plasma

Solar energy

Cosmic rays

3. What is the interaction of light with matte called?

Mechanics

Aerodynamics

Materials science

Optics

4. When light passes from one medium to another it often bends. What is this bending called?

Diffraction

Refraction

Reflection

Calefaction

5. What type of electromagnetic waves can have wavelengths on the order of meters?

Gamma rays

TV and Radio waves

X-rays

Microwaves

6. What type of radiationis used in radiography?

Ultrasound

Gamma rays

X-rays

Microwaves

7. How do microwaves cook food ?

Conduction

Excitation of water molecules

Convection

Transmutation

8. What is another name for heat?

Infrared radiation

Ultrasound

Untraviolet radiation

Gamma radiation

9. What is the quantity that is the rate that a body radiates per unit time?

Luminance

Lustrousness

Illumination

Luminosity

10. Which of the following technologies does not use electromagnetic radiation?

Sonar

Microscopy

Radar

Fiber optical telephony

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