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3 years ago

David Fee studies sound waves so deep and low that humans cannot hear them. What are these low frequencies

Biology

2 answers:

Mashutka [201]3 years ago

6 0

Infasound ✅ it’s under 20Hz but many animals can hear this sound. Humans cannot

timofeeve [1]3 years ago

5 0

Answer: infrasound

Explanation:

The infrasound is called as the low frequency sound. The frequency of these sounds is less than 20 Hz. The sound waves of the infrasound cannot be perceived by the humans as human ear are less sensitive to the low frequency. The infrasound can be produced in extreme weather conditions, earthquakes, meteor impacts, explosive detonation, collision of oceanic waves, waves on beach, and sound produced by the air conditioner.

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Joyce is planting tulips in her garden, and she has 5 red bulbs and 5 white bulbs to plant in one row. What is the probability t

Stolb23 [73]

Answer:

$\frac{1}{126}$ or 0.0079.

Explanation:

Joyce is planting tulips in her garden.

Number of red (R) bulbs = 5

Number of white (W) bulbs = 5

Total number of ways to plant 10 bulbs in one row is

$\text{Total ways}=\frac{10!}{5!5!}$

$\text{Total ways}=\frac{10\times 9\times 8\times 7\times 6\times 5!}{5\times 4\times 3\times 2\times 1\times 5!}$

Cancel out common factors.

$\text{Total ways}=252$

It is given that she randomly plants the bulbs so that all 5 red bulbs are next to each other and all 5 white bulbs are next to each other.

Required outcomes are

RRRRRWWWWW and WWWWWRRRRR

$\text{Required outcomes}=2$

Formula for probability:

$Probability=\frac{\text{Required outcomes}}{\text{Total ways}}$

$Probability=\frac{2}{252}$

$Probability=\frac{1}{126}$

$Probability\approx 0.0079$

Therefore the required probability is $\frac{1}{126}$ or 0.0079.

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3 years ago

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