Last Updated On 16-03-2023 - By Jeesha Sara
A train moves towards a stationery observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is 
. If the speed of the train is reduced to 17 m/s, the frequency registered is 
.if speed of sound is 340 m/s, then the ratio 
is :
(a)
18/17
(b)
19/18
(c)
20/19
(d)
21/20
A train moves towards a stationery observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is . If the speed of the train is reduced to 17 m/s, the frequency registered is .if speed of sound is 340 m/s, then the ratio is :
(a)
18/17
(b)
19/18
(c)
20/19
(d)
21/20
Question ID - 50241 :-
A train moves towards a stationery observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is . If the speed of the train is reduced to 17 m/s, the frequency registered is .if speed of sound is 340 m/s, then the ratio is :
(a)
18/17
(b)
19/18
(c)
20/19
(d)
21/20
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A train moves towards a stationery observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is |
|||
|
(a) |
18/17 |
(b) |
19/18 |
|
(c) |
20/19 |
(d) |
21/20 |
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Next Question :
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In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5 |
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(a) |
100 keV |
(b) |
500 keV |
|
(c) |
25 keV |
(d) |
1 keV |
m, the minimum electron energy required is close to :View Topper Answer
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