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4 years ago

The electromagnetic waves described as both beneficial and detrimental to human health are _____ waves.

2 answers:

4 0

The answer is X- rays. The benefit of X rays is their use in medical imaging. This is because of their property to penetrate some matter, such as tissues, differentially. This property is significant in disease diagnosis. However, X rays are detrimental to the human health, especially in above-recommended doses. The high energy of X rays can damage DNA in cells and cause mutations that lead to cancer.

julia-pushkina [17]4 years ago

3 0

I'm not positive but I'm pretty sure its Light waves.

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g The decomposition reaction of A to B is a first-order reaction with a half-life of 2.42×103 seconds: A → 2B If the initial con

Tanzania [10]

Answer:

In 23.49 minutes the concentration of A to be 66.8% of the initial concentration.

Explanation:

The equation used to calculate the constant for first order kinetics:

$t_{1/2}=\frac{0.693}{k}}$ .....(1)

Rate law expression for first order kinetics is given by the equation:

$t=\frac{2.303}{k}\log\frac{[A_o]}{[A]}$ ......(2)

where,

k = rate constant

$t_{1/2}$ =Half life of the reaction = $2.42\times 10^3 s$

t = time taken for decay process = ?

$[A_o]$ = initial amount of the reactant = 0.163 M

[A] = amount left after time t = 66.8% of $[A_o]$

[A]= $\frac{66.8}{100}\times 0.163 M=0.108884 M$

$k=\frac{0.693}{2.42\times 10^3 s}$

$t=\frac{2.303}{\frac{0.693}{2.42\times 10^3 s}}\log\frac{0.163 M}{0.108884 M}$

t = 1,409.19 s

1 minute = 60 sec

$t=\frac{1,409.19 }{60} min=23.49 min$

In 23.49 minutes the concentration of A to be 66.8% of the initial concentration.

6 0

3 years ago

1) 0.143 g Mg into atoms<br> 2) 0.101 kg Ti into atoms

Neporo4naja [7]

Answer:

The answer to your question is below

Explanation:

1) 0.143g of Mg into atoms

- Look for the atomic number of Magnesium in the Periodic table

Atomic number = 24.31 g

-Use the Avogadro's number to find the number of atoms

24.31g ------------------- 6.023 x 10²³ atoms

0.143 g ----------------- x

x = (0.143 x 6.023 x 10²³) / 24.31

x = 8.613 x 10²² / 24.31

x = 3.54 x 10²¹ atoms

2) 0.101 kg of Ti into atoms

-Look for the atomic number of Titanium in the Periodic table

Atomic number = 47.87 g

-Use the Avogadro's number to find the number of atoms

47.87 g --------------------- 6.023 x 10²³

101 g ---------------------- x

x = (101 x 6.023 x 10²³) / 47.87

x = 6.08x 10²⁵ / 47.87

x = 1.27 x 10²⁴ atoms

3 0

3 years ago

The temperature of a gas is 100 K and its volume is 500.0 ml. If the volume increases to 1,000.0 ml,

olga55 [171]

1000000000000000 that’s the answer

5 0

3 years ago

Someone drops a book on the floor, and it makes a loud noise. At that time, you turn to look at the person who dropped the book.

Rudiy27

Answer: Stimulus

Explanation: The definition of Stimulus is "a thing or event that evokes a specific functional reaction in an organ or tissue," according to the Oxford Dictionary. So the book dropping and causing a noise is an example of a stimulus.

6 0

4 years ago

Why do so many of earths volcanoes occur along plate boundaries

OverLord2011 [107]

Because of the plates crashing into each other

4 0

3 years ago