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lord [1]
3 years ago
8

Which type of pollution comes from dust, dirt, and soot lingering in the air?

Health
2 answers:
Ket [755]3 years ago
7 0
B because it's just particles
Advocard [28]3 years ago
6 0
B Is the answer I think
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A and B

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What is an example of a decision-making framework?
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3 years ago
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Paano nila ipinakita ang pangangalaga sa mga halaman?​
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3 years ago
A 5 Mhz ultrasound beam in soft tissue reflects off an object 5 cm deep. The time required to receive the echo at the transducer
miss Akunina [59]

Answer:

The time required to receive the echo at the transducer is t=3.34\times 10^{-10}\ s

Explanation:

Frequency of ultrasonic beam, f = 5 MHz

It reflects off an object 5 cm deep.

We need to find the time required to receive the echo at the transducer. The ultrasonic wave is an electromagnetic wave. it moves with a speed of light. Let t is the time taken by the wave to go once.

So,

t=\dfrac{d}{c}

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t=1.67\times 10^{-10}\ s

Time to receive the echo at the transducer gets doubled. So,

t=3.34\times 10^{-10}\ s

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3 years ago
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