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Musya8 [376]
3 years ago
5

When a sound source approaches you, the pitch you hear is

Chemistry
1 answer:
IgorC [24]3 years ago
7 0
Higher <span>C. higher than when the source is stationary</span>
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One of the radioactive isotopes used in medical treatment or analysis is chromium-51. The half-life of chromium-51 is 28 days. H
Goryan [66]

Answer : The time required for decay is, 84 days.

Explanation :

Half-life of chromium-51 = 28 days

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{28\text{ days}}

k=0.0248\text{ days}^{-1}

Now we have to calculate the time required for decay.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = time taken by sample = ?

a = let initial activity of the sample = 100

a - x = amount left after decay process  = 12.5

Now put all the given values in above equation, we get

t=\frac{2.303}{0.0248}\log\frac{100}{12.5}

t=83.9\text{ days}\approx 84\text{ days}

Therefore, the time required for decay is, 84 days.

7 0
3 years ago
Given 0.02 of KF, how many liters of solution are needed to make a 7.2 solution?
Dmitry_Shevchenko [17]

Answer:

1/360

Explanation:

let x = liters

molarity=moles of solute/liters of solution, 7.2=0.02/x or 7.2=(1/50)(1/x), 7.2(50)=(1/x), 360(x)=1, x=1/360

7 0
3 years ago
Water that has condensed and formed water droplets on the ground, grass, and other outdoor objects is known as _____.
Amanda [17]
The correct answer is B. Water that has condensed and formed water droplets on the ground, grass, and other outdoor objects is known as dew. It is water formed due to condensation in early morning or evening. It is formed when the temperature of the objects reach below the dew point of the air around.
5 0
3 years ago
Read 2 more answers
What would be the atomic mass of Nitrogen-14​
Maurinko [17]

Answer:

The atomic mass of nitrogen is

<h2>14.0067 u</h2>

<h2><em>You learn more from failure than from success</em></h2>
7 0
2 years ago
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Noise Pollution: An Invisible Threat to Humans and animals.
soldi70 [24.7K]

Answer:

Explanation:

Noise pollution occurs when we have a house which is more than 65 decibels. The effects of noise pollution include physical effects which can be respiratory agitation, headaches, high blood pressure, etc.

Another effect is the psychological effect such as depression, anxiety, fatigue etc. Stress can also lead to sleep disorders and lack of concentration.

The ways to reduce noise pollution are:

1. Using awareness campaign: People should be told about the harmful effects of noise. This will be vital in reducing noise.

2. Government control: Government can play their role by telling those who doesn't adhere to laid out rules regarding noise to pay a fine. Anyone found wanting should pay a fine.

4 0
3 years ago
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