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nikitadnepr [17]
3 years ago
9

In a chemical change one substance will __________ another subsatnce

Physics
1 answer:
larisa86 [58]3 years ago
7 0
Answer: change

you're welcome (-;
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Diagnostic ultrasound of frequency 4.50 MHz is used to examine tumors in soft tissue. (a) What is the wavelength in air of such
mafiozo [28]

(a) 7.62 \times 10^{-5} m is the wavelength in air of such a sound wave.

(b) 3.33 \times 10^{-4}\ m is the wavelength of this wave in tissue.

<u>Explanation:</u>

Frequency and wavelength can be related by the equation,

              Velocity = Wavelength x Frequency

              v=\lambda \times f

where,

v - velocity of light for all EM (electromagnetic) waves in vacuum

Given:

f - 4.50 MHz = 4.50 \times 10^{6} \mathrm{Hz}

a) To find the wavelength in air

We know,

Speed of sound in air = 343 m/s

Apply given frequency and speed of sound in air, we get

        \lambda=\frac{v}{f}=\frac{343}{4.5 \times 10^{6}}=76.2 \times 10^{-6}=7.62 \times 10^{-5}\ \mathrm{m}

b) If the speed of sound in tissue is 1500 m/s, find the wavelength of this wave in tissue

Speed of sound in tissue, v = 1500 m/s

        \lambda=\frac{v}{f}=\frac{1500}{4.5 \times 10^{6}}=333.33 \times 10^{-6}=3.33 \times 10^{-4} \mathrm{m}

4 0
3 years ago
Q.1 Newton's second law gives the measure of--------------. 1)Acceleration 2) Force 3) Momentum 4)Angular momentum​
posledela

Answer:

1. Acceleration

Explanation:

Newtons Second law gives the measure of acceleration

4 0
4 years ago
A negative charge of -0.550 m exerts an upward <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5868766e
almond37 [142]

Answer:

a. +10.9μC

b. 0.600N and downward

Explanation:

To determine the magnitude of the charge, we use the force rule that exist between two charges which us expressed as

F=(kq₁q₂)/r²

since q₁=-0.55μC and the force it applied on the charge above it is upward,we can conclude that the second charge is +ve, hence we calculate its magnitude as

q₂=Fr²/kq₁

q₂=(0.6N*0.3²)/(9*10⁹*0.55*10⁻⁶)

q₂=0.054/4950

q₂=1.09*10⁻⁵c

q₂=10.9μC.

Hence the second charge is +10.9μC

b. From the rule of charges which state that like charges repel and unlike charges attract, we can conclude that the two above charges will attract since they are unlike charges. Hence the direction of the force will be downward into the second charge and the magnitude of the force will remain the same as 0.600N

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4 years ago
Of the cloud types described here, which one cannot be easily classified as low, middle, or high?
diamong [38]
Cumulonimbus clouds
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3 years ago
Sound waves travel faster through air than through solids. Please select the best answer from the choices provided T F
katrin2010 [14]

False it travels faster through solids than it travels through air.

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3 years ago
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