Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
4
Chapter 4: Work and Energy
128 questions
5
Chapter 5: Sound
162 questions
Q1
Question 39:
If 20 waves are produced per second, What is the frequency is hertz?
Q2
Question 40:
Fill in the following blanks with suitable words.
(a) Sound waves are caused by ____________.
(b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________.
(c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________.
(d) Sound cannot travel through ____________.
(e) The sound travels ____________ in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength ____________.
(a) Sound waves are caused by ____________.
(b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________.
(c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________.
(d) Sound cannot travel through ____________.
(e) The sound travels ____________ in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength ____________.
Q3
Question 41:
What is the vacuum? Explain why, sound cannot travel through vacuum?
View all questionQuestion
Question 40:
Fill in the following blanks with suitable words.
(a) Sound waves are caused by ____________.
(b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________.
(c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________.
(d) Sound cannot travel through ____________.
(e) The sound travels ____________ in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength ____________.
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Text solution
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Answer:
(a) Sound waves are caused by vibrations.
(b) A sound wave consists of places of higher pressure called compressions and places of lower pressure called rarefactions.
(c) Wave speed in meters per second equals frequency in hertz multiplied by wavelength in meters.
(d) Sound cannot travel through vacuum.
(e) The sound travels faster in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength decreases.
(b) A sound wave consists of places of higher pressure called compressions and places of lower pressure called rarefactions.
(c) Wave speed in meters per second equals frequency in hertz multiplied by wavelength in meters.
(d) Sound cannot travel through vacuum.
(e) The sound travels faster in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength decreases.
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Practice more questions from Physics (Lakhmir Singh)
Q1
Question 39:
If 20 waves are produced per second, What is the frequency is hertz?
Q2
Question 40:
Fill in the following blanks with suitable words.
(a) Sound waves are caused by ____________.
(b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________.
(c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________.
(d) Sound cannot travel through ____________.
(e) The sound travels ____________ in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength ____________.
(a) Sound waves are caused by ____________.
(b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________.
(c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________.
(d) Sound cannot travel through ____________.
(e) The sound travels ____________ in a solid than in a gas.
(f) When the frequency of the sound is increased, the wavelength ____________.
Q3
Question 41:
What is the vacuum? Explain why, sound cannot travel through vacuum?
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| Question Text | Question 40:
Fill in the following blanks with suitable words. (a) Sound waves are caused by ____________. (b) A sound wave consists of places of higher pressure called ____________ and places of lower pressure called ____________. (c) Wave speed in meters per second equals frequency in ____________ multiplied by ____________ in ____________. (d) Sound cannot travel through ____________. (e) The sound travels ____________ in a solid than in a gas. (f) When the frequency of the sound is increased, the wavelength ____________. |
| Topic | Sound |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 |
| Upvotes | 37 |
