3 years ago

Which environmental factor can lead to food contamination?

Health

2 answers:

Marysya12 [62]3 years ago

7 0

Microorganisms that are found in the environment.

Kaylis [27]3 years ago

5 0

Unsanitary utensils and unwashed surface and hands can lead to food borne illness from whatever germs may reside on the items used to prepare it.

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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,

$t=\dfrac{d}{c}$

$t=\dfrac{0.05\ m}{3\times 10^8\ m/s}$

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

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

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

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