Physics for IGCSE & O level - Rays And Waves (Section 5)
1
Απάντηση(B)
An image that appears to come from behind the mirror
2
What is the term for the angle of incidence for which the angle of refraction is 90 degrees?
3
What are examples of uses of radio waves?
4
What is an application of total internal reflection?
5
What happens to light when it passes through a glass block?
6
What does refraction refer to?
7
What are the potential dangers of X-rays?
8
Which of the following types of electromagnetic waves cause ionization?
9
Which part of the electromagnetic spectrum is used for remote controls?
10
In an optical fiber, what phenomenon keeps the light inside the fiber?
Απάντηση(C)
Total internal reflection
11
In a simple telephone system, what does the decoder do?
Απάντηση(A)
Converts electrical signals into sound
12
What is the meaning of the term "digital signal"?
Απάντηση(B)
A signal represented by numbers.
13
Which type of lens is used in a telescope?
14
Which of the following is the best definition of the 'normal' line?
Απάντηση(C)
A line perpendicular to the surface at the point of incidence
15
What is the unit of measurement for the refractive index?
16
Απάντηση(B)
An image that cannot be projected onto a screen.
17
In a plane mirror, the image appears to be where?
18
What type of lens is a diverging lens?
19
In short sight, where does the image focus?
20
What type of radiation is used to detect heat?
21
Which of the following is an example of total internal reflection?
22
What is the function of the transmission path in a phone system?
Απάντηση(B)
To transmit information over a distance.
23
What is the role of an antenna in radio communication?
Απάντηση(B)
To convert electrical signals into radio waves
24
What is the role of the pupil in the human eye?
25
What type of image can be projected onto a screen?
26
How can the frequency of light increase?
27
What is the key feature of digital signals?
Απάντηση(B)
They are represented by numbers.
28
What do we call the device that converts electrical signals into a form that can be transmitted?
29
Which part of the electromagnetic spectrum is visible to the human eye?
30
What type of lens forms a real image?
31
How does light bend when it passes from a less dense to a more dense medium?
32
What is the angle of reflection in relation to the angle of incidence?
33
What is a benefit of using optical fibres?
Απάντηση(B)
They can transmit signals over long distances with minimal signal loss.
34
What type of wave is an electromagnetic wave?
35
What is the purpose of an encoder in telecommunications?
Απάντηση(B)
To convert information into a transmittable format
36
What is the name given to the light that does not hit the surface?
37
What is the normal in relation to a reflecting surface?
Απάντηση(B)
A line perpendicular to the surface
38
What is the role of an antenna in a radio system?
Απάντηση(B)
To convert radio waves into electrical signals and vice versa
39
What is the basic principle behind an endoscope?
Απάντηση(C)
Total internal reflection
40
Which type of electromagnetic radiation is used by mobile phones?
41
Which of the following are uses for optical fibers?
42
What does the refractive index of a material indicate?
Απάντηση(C)
The amount light is bent by the material
43
Which color of light has the highest frequency?
44
What form of radiation is used for medical imaging?
45
Which of the following correctly describes the relationship between energy and frequency in electromagnetic waves?
Απάντηση(B)
Energy is directly proportional to frequency
46
What is a common use of infrared radiation?
47
What causes light to change direction when it enters a new medium?
48
When does light travel in straight lines?
49
What happens to light when it passes through a prism?
Απάντηση(C)
It splits into a range of colors.
50
Which of the following is used in fiber optic communication?
Απάντηση(D)
Total Internal Reflection
