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3 years ago

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What is the formula for the ion potassium

1 answer:

LiRa [457]3 years ago

6 0

Answer:

The formula for a Potassium ion is K+

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38 POINTS IF YOU CAN HELP ME PLEASE PLEASE PLEASEEE

guajiro [1.7K]

Red blood cell is the answer I think

6 0

3 years ago

I'll be so thankful if u helped me <<33

qwelly [4]

Answer: its B , B is the answer.

Explanation:

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3 years ago

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A laser pulse with wavelength 525 nm contains 4.40 mj of energy. How many photons are in the laser pulse

Alexandra [31]

The laser pulse in this question has a wavelength of $\lambda=524 nm=525\times 10^{-9}m$ . To solve this problem, we first have to calculate the energy of a single photon in the laser pulse. The equation for calculating the energy of a single photon of an electromagnetic wave is $E=\frac{hc}{\lambda}$ where $c$ is the speed of light, $h$ is planks constant and $\lambda$ is the wave length of the photons.

For this problem, $c=3.0\times 10^8m/s$ , $h=6.63\times10^{-34}J.s$ and $\lambda=525\times 10^{-9}m$ . We use these values to calculate the energy of the photon as shown below,

$E=\frac{hc}{\lambda} \\E=\frac{(6.63\times 10^{32}Js)\times(3.0\times10^8m/s)}{525\times 10^{-9}m} \\E=3.79\times 10 ^{-19}J.$

Now that we know the energy for a single photon, we will divide the total energy given by the energy of one photon to get the number of photons in the pulse. The number of photons $n$ is calculated as shown below,

$n=\frac{4.4\times 10^{-3}J}{3.79\times10^{-19}J} =1.16\times 10^{16}$ . There are $1.16\times 10^{16}$ photons.

5 0

3 years ago

The density of mercury is 13.5 g/mL and the density of water is 1.00 g/mL. If a mercury barometer reads 805 mmHg, what is the ba

Marina86 [1]

Answer:

Barometric pressure will be $1086.75 cm H_{2}O$

Explanation:

We know, $P=h\rho g$

where P is barometric pressure, h is height of liquid inside barometer, $\rho$ is density of liquid and g is gravitational constant

If barometric pressure is x cm $H_{2}O$ for 805 mm Hg then-

$x\times (1.00g/mL)\times g=(805\times 10^{-1}cm Hg)\times (13.5g/mL)\times g$

So, $x=1086.75 cm H_{2}O$

Hence barometric pressure will be $1086.75 cm H_{2}O$

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3 years ago

This system identifies the scratch resistance of various minerals through the ability of a harder material to scratch a softer m

mart [117]

Answer:

Mohs Scale

<em>i think so</em>

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4 years ago

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