SPEED OF SOUND IN DIFFERENT MEDIA
74. Sound of a thunder is heard ---------------- than the flash of light is seen.
75. The speed of sound is ---------------- the speed of light.
76. Temperature influences the speed of sound. True or False?
77. The speed of sound ---------------- when we go from solid to gaseous state.
78. In any medium, as we increase the temperature the speed of sound increases. True or False? Give example.
79. Go through the table 12.1.
REFLECTION OF SOUND
80. Sound gets reflected at the surface of a solid and liquid. True or False?
81. What is normally needed for the reflection of the sound waves?
82. Learn the activity related to reflection of sound and understand the process.
ECHO
83. What is called an echo?
84. The sensation of sound persists in our brain for about --------- s.
85. When could you hear a distinct echo? Explain in detail.
86. What is t
he relationship between echo and the rolling of thunder?
REVERBERATION
87. What is reverberation?
88. What are the steps to be taken to reduce reverberation?
USES OF MULTIPLE REFLECTION OF SOUND
89. How are the musical instruments designed to send sound?
90. How is the sound heard in the stethoscope?
93. How are the ceilings of the concert halls designed?
RANGE OF HEARING
94. The audible range of sound for human beings extends from about ------------ to ------------.
95. Children upto five years and dogs can hear upto ----------------.
96. How is the hearing affected as the human beings grow old?
97. What are called infrasound or infrasonic sound?
98. What is the infrasound of frequency used by rhinoceroses for communication?
99. How can some animals hear the sound of earth quake even before it occurs?
100. What are called ultra sound or ultrasonic sound?
101. Name the creatures that produce ultrasonic sound.
APPLICATIONS OF ULTRASOUND
102. How are ultrasounds used extensively in industries and for medical purposes?
103. How is ultrasound used for the purpose of cleaning?
104. How can ultrasounds be used to detect cracks and flaws in metal blocks?
105. What is called echocardiography / ECG?
106. Describe the functioning and uses of ultrasonic scanner.
107. What is called ultrasonography?
108. What is the use of utltrasound in the breaking and removal of kidney stones?
SONAR
109. Expand SONAR.
110. What is sonar?
111. How does the sonar work? Explain in detail.
112. What is called echo-ranging?
113. What are the uses of sonar?
114. How do bats locate food in the dark?
115. Why do porpoises use ultrasound?
STRUCTURE OF HUMAN EAR
116. Describe in detail the auditory aspect of human ear.
117. What is pinna?
118. What is the function of pinna?
119. What is the function of the middle ear?
120. What is cochlea? What is its function?
74. Sound of a thunder is heard ---------------- than the flash of light is seen.
75. The speed of sound is ---------------- the speed of light.
76. Temperature influences the speed of sound. True or False?
77. The speed of sound ---------------- when we go from solid to gaseous state.
78. In any medium, as we increase the temperature the speed of sound increases. True or False? Give example.
79. Go through the table 12.1.
REFLECTION OF SOUND
80. Sound gets reflected at the surface of a solid and liquid. True or False?
81. What is normally needed for the reflection of the sound waves?
82. Learn the activity related to reflection of sound and understand the process.
ECHO
83. What is called an echo?
84. The sensation of sound persists in our brain for about --------- s.
85. When could you hear a distinct echo? Explain in detail.
86. What is t
he relationship between echo and the rolling of thunder?
REVERBERATION
87. What is reverberation?
88. What are the steps to be taken to reduce reverberation?
USES OF MULTIPLE REFLECTION OF SOUND
89. How are the musical instruments designed to send sound?
90. How is the sound heard in the stethoscope?
93. How are the ceilings of the concert halls designed?
RANGE OF HEARING
94. The audible range of sound for human beings extends from about ------------ to ------------.
95. Children upto five years and dogs can hear upto ----------------.
96. How is the hearing affected as the human beings grow old?
97. What are called infrasound or infrasonic sound?
98. What is the infrasound of frequency used by rhinoceroses for communication?
99. How can some animals hear the sound of earth quake even before it occurs?
100. What are called ultra sound or ultrasonic sound?
101. Name the creatures that produce ultrasonic sound.
APPLICATIONS OF ULTRASOUND
102. How are ultrasounds used extensively in industries and for medical purposes?
103. How is ultrasound used for the purpose of cleaning?
104. How can ultrasounds be used to detect cracks and flaws in metal blocks?
105. What is called echocardiography / ECG?
106. Describe the functioning and uses of ultrasonic scanner.
107. What is called ultrasonography?
108. What is the use of utltrasound in the breaking and removal of kidney stones?
SONAR
109. Expand SONAR.
110. What is sonar?
111. How does the sonar work? Explain in detail.
112. What is called echo-ranging?
113. What are the uses of sonar?
114. How do bats locate food in the dark?
115. Why do porpoises use ultrasound?
STRUCTURE OF HUMAN EAR
116. Describe in detail the auditory aspect of human ear.
117. What is pinna?
118. What is the function of pinna?
119. What is the function of the middle ear?
120. What is cochlea? What is its function?
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