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Answers
Answer:
why should we wastage the food?
Answer:
Page No 185:
Question 1:
Can sound travel through (a) iron, and (b) water?
ANSWER:
Yes, sound can travel through iron as well as water.
Page No 185:
Question 2:
Can sound travel through vacuum?
ANSWER:
No, sound cannot travel through vacuum because sound wave requires a material medium for its propagation.
Page No 185:
Question 3:
Name the type of waves which are used by astronauts to communicate with one another on moon (or in outer space).
ANSWER:
Radio waves are used by astronauts to communicate with one another on moon because radio waves do not require any material medium for its propagation.
Page No 185:
Question 4:
Name one solid, on liquid and one gas through which sound can travel.
ANSWER:
Sound waves require a material medium for its propagation so that it can travel in all the three states of matter:
solid (iron block), liquid (water), and gas (hydrogen).
Page No 185:
Question 5:
Which of the following cannot transmit sound?
Water, Vacuum, Aluminium, Oxygen gas
ANSWER:
Among the following, vacuum cannot transmit sound because sound waves require a material medium for its propagation.
Page No 185:
Question 6:
Name the physical qantity whose SI unit is 'hertz'.
ANSWER:
Frequency is the physical quantity and its SI unit is hertz (Hz).
Page No 185:
Question 7:
What is the SI unit of frequency?
ANSWER:
The SI unit of frequency is hertz (Hz).
Page No 185:
Question 8:
What type of wave is represented :
(a) by density-distance graph?
(b) by displacement-distance graph?
ANSWER:
(a) Longitudinal waves are represented by density–distance graph.
(b) Transverse waves are represented by displacement–density graph.
Page No 185:
Question 9:
Is the speed of sound more in water or in steel?
ANSWER:
Sound travels faster in steel than in water. In solids, the distances between the molecules are closer and thus the atoms are more densely packed than in liquids. Therefore, the molecules quickly collide with one another and transfer the vibrational energy.
Page No 185:
Question 10:
In which medium sound travels faster : air or iron?
ANSWER:
Sound travels faster in iron than in air. In solids, the distances between the molecules are closer and thus the atoms are more densely packed than in gases. Therefore, the molecules quickly collide with one another and transfer the vibrational energy.
Page No 185:
Question 11:
In which medium sound travels fastest : air, water or steel?
ANSWER:
Sound travels faster in steel than in water. Similarly, sound travels faster in water than in air. This is because in solids, the distances between the molecules are closer and thus the atoms are more densely packed than in gases and liquids. Therefore, the molecules quickly collide with one another and transfer the vibrational energy. Similarly, in liquids the molecules are closer to one another than in gases.
Page No 185:
Question 12:
Out of solids, liquids and gases :
(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?
ANSWER:
In solids, the distances between the molecules are closer and thus the atoms are more densely packed than in gases and liquids. Therefore, the molecules quickly collide with one another and transfer the vibrational energy. Similarly, in liquids the molecules are closer to one another than in gases. Therefore, the following data is inferred:
(a) Sound travels slowest in gases.
(b) Sound travels fastest in