Choose the correct options for the following questions.
In space, sound waves cannot travel because there is:
Difficulty: Easy
A:
Air
B:
Gravity
C:
Light
D:
Vacuum
Sound waves having frequencies between 2k Hz and 4k Hz are called:
Difficulty: Easy
A:
Infrasonics
B:
Ultrasonics
C:
Threshold hearing
D:
None
The ratio of speed of sound in hydrogen to the speed of sound in oxygen is:
Difficulty: Easy
A:
4:1
B:
1:4
C:
8:1
D:
1:8
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