science last sem Flashcards
describe the electromagnetic spectrum
A continuum of all possible frequencies of electromagnetic radiation.
Which of the following statements about the electromagnetic spectrum is true?
a. It encompasses all possible frequencies of electromagnetic radiation.
b. It consists solely of radio waves and microwaves.
c. It only includes visible light.
d. It is limited to X-rays and gamma rays.
a
Which type of electromagnetic radiation has the longest wavelength?
radio wave
Question: Which of the following devices uses infrared radiation?
a. X-ray machine
b. fluorescent light bulb
c. Microwave oven
d. Remote control
d
Which type of electromagnetic radiation has the highest energy?
Ultraviolet radiation
Which part of the electromagnetic spectrum is used for medical imaging to see inside the human body (succeeding with the highest frequency)?
X-rays
How does the interaction of electromagnetic waves with matter differ across the spectrum?
a. Electromagnetic waves do not interact with matter at all.
b. Electromagnetic waves always interact with matter in the same way regardless of their frequency.
c. Electromagnetic waves only interact with matter at specific wavelengths.
d. Electromagnetic waves interact with matter differently depending on their frequency and wavelength.
d
Explain why certain frequencies of electromagnetic radiation, such as gamma rays and X-rays, are used in medical imaging procedures.
a. Because they have the ability to penetrate through tissues and create detailed images of bones and internal organs.
b. Because they have the longest wavelengths, allowing them to travel deep into the body.
c. Because they are the only frequencies that can be detected by medical equipment.
d. Because they are easily absorbed by the human body, making them safe for medical use.
a
Discuss the potential risks and benefits associated with the use of ultraviolet (UV) radiation in everyday life.
a. UV radiation has the potential to cure all types of cancer without any side effects.
b. UV radiation can cause skin cancer but is also necessary for the production of vitamin D in the skin.
c. UV radiation is harmless and has no effect on human health.
d. UV radiation is only used in specialized scientific research and has no practical applications.
b
Analyze the role of radio waves in modern communication systems.
a. Radio waves are limited in their ability to carry information and are not suitable for communication.
b. Radio waves are only used for entertainment purposes and have no other applications.
c. Radio waves are used to transmit information over long distances through radio, television, and cellular networks.
d. Radio waves are primarily used for heating food in microwave ovens.
c
Evaluate the impact of technological advancements in understanding and utilizing the electromagnetic spectrum
a. Technological advancements have had no significant impact on our understanding or use of the electromagnetic spectrum.
b. Technological advancements have led to improved methods of communication, medical imaging, and scientific research.
c. Technological advancements have focused solely on harnessing visible light for practical applications.
d. Technological advancements have made it more difficult to study and utilize the electromagnetic spectrum.
b
In 1820, Hans Christian Oersted discovered that electricity could produce magnetism while conducting an experiment in his class by ___________.
a. consciously
b. assurance
c. serendipity
d. mischance
c
He discovered magnetism can produce electricity.
Michael Faraday
The unit of Magnetic flux was named after him.
Wilhelm Eduard Weber
He formulated the concept of photoelectric effect.
Albert Einstein
