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Fill inthe blanks:
1. Man can hear sounds of frequencies between 20 Hz and 20,000 Hz.
2. Dogs can hear ultrasonic sound.
Match the Pair:
1. Frequency - Hertz
2. Bat- Ultrasonic Sound
True or False:
1. Ultrasonic sounds are produced in the sonar system. True
2. The unit of frequency is hertz. False
Define:
1. Frequency: The number of oscillations that an object complete s in one second is called the frequency.
2. Ultrasonic Sound: Sounds of frequencies higher than 20,000 Hz are called ultrasonic sound.
Answer in one sentence:
1. What is the SONAR system based on?
Ans: SONAR is kind of Radar based on ultrasonic sound reflection.
2. What are the two types of sounds?
Ans: Audible and Inaudible are the two types of sounds.
Give Reasons:
A radar system can detect flying objects.
Ans: A radar system tells the position of objects by getting the waves it produces reflected from the targets in front. So, a radar system can detect flying objects.
Answer in Short:
How does a bat find its way in the dark?
Ans: Bats can produce ultrasonic sounds while flying in the dark. The sound is reflected from objects in front of the bat. From reflected sound the bat comes to know of the position of things in its surroundings.
Answer in One Word:
1. Which type of sound produced by the bats? - Ultrasonic sound
2. Maximum distance that the pendulum moves from its mean position. - Amplitude
Solve the crossword.
Across
3. Sound that can heard by human ears
4. Unit of sound
5. An animal that produce ultrasonic sound
Down
1. A system of ultrasonic sound used in medical field
2. Necessary for production of sound
