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An isotope of cesium (137) has a half-life of 30 years. if 1.0mg of cesium -137 disintegrates over a period of 90 years how many mg of cesium -137 would remain

This is for school i tought myself how to do one of these problems but now its harder well i think so and there is more questoins i have and i need this explained like how u got the answer

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Half of it goes away in the first 30 years, leaving 0.5mg. Half of that goes away in the second 30 years, leaving 0.25mg. Half of that goes away in the third 30 years, leaving 0.125mg after 90 years.

Posted on Feb 23, 2012


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SOURCE: Actinium-226 has a half life

Hope it helps

Posted on May 12, 2011

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How do I measure 15 mg out of 20 mg?

I assume you don't have any weigh scales to measure it.
Whatever the substance is, I would try and make the shape as uniform as possible. Cut it in half. Cut one of the halfs in half again to produce two quarters. Take away one of the quarters. What is left should be close to 15 mg.

Good luck,


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How are protons organized ?

Atomic protons? The nucleus of the atom of each stable element has a certain number of protons, and except for hydrogen, also neutrons. These numbers are what differentiate the elements and give them properties, whether gaseous, metallic, alkaline, reactive or inert. Protons have a positive electrical charge.

The number of electrons will match the number of protons to give a stable atom a neutral net charge. An atom which loses or gains an electron or 2 is known as an ion. An atom which gains one or more neutrons is known as an isotope. However ions and isotopes still have their proper numbers of protons.

Ions will seek to attach to another particle so as to gain stability. Isotopes will decay over time, sometimes thousands of years.

All the elements are arranged in families or groups where chemical properties are comparable, in the Periodic Table of the Elements

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What if 50mg of actinium-226 disintegrates over a period of 87hours, how many mg of actinium-226 will return?

The half life of Actinium 226 is about 1.2 days (Check with the source of the question). Let the half life be T_1/2.
The equation of the radioactive decay is
For the mass

There remains 6.16 mg after 87 hours.

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What is Term Life insurance?

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What percentage of a watermelon is water?

About 91% is water content.
Please check the breakup and nutritional value in the link below;
Watermelon, raw (edible parts) Nutritional value per 100 g (3.5 oz) Energy 127 kJ (30 kcal) Carbohydrates 7.55 g - Sugars 6.2 g - Dietary fiber 0.4 g Fat 0.15 g Protein 0.61 g Water 91.45 g Vitamin A equiv. 28 μg (3%) Thiamine (Vit. B1) 0.033 mg (3%) Riboflavin (Vit. B2) 0.021 mg (1%) Niacin (Vit. B3) 0.178 mg (1 Watermelon, raw (edible parts) Nutritional value per 100 g (3.5 oz) Energy 127 kJ (30 kcal) Carbohydrates 7.55 g - Sugars 6.2 g - Dietary fiber 0.4 g Fat 0.15 g Protein 0.61 g Water 91.45 g Vitamin A equiv. 28 μg (3%) Thiamine (Vit. B1) 0.033 mg (3%) Riboflavin (Vit. B2) 0.021 mg (1%) Niacin (Vit. B3) 0.178 mg (1 Watermelon, raw (edible parts) Nutritional value per 100 g (3.5 oz) Energy 127 kJ (30 kcal) Carbohydrates 7.55 g - Sugars 6.2 g - Dietary fiber 0.4 g Fat 0.15 g Protein 0.61 g Water 91.45 g Vitamin A equiv. 28 μg (3%) Thiamine (Vit. B1) 0.033 mg (3%) Riboflavin (Vit. B2) 0.021 mg (1%) Niacin (Vit. B3) 0.178 mg (1

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We at CAAP Davao Philippines have a MGE Galaxy 3000 10KVa UPS with serial no. 13299-4. It was installed last 2003. We had three times replaced its batteries over the period of years, the latest was 2008....

On the Galaxy display you could see what is the remaining battery life time as calculated by the software. Normally after you replaced the batteries you are supposed to reset this counter using specific software by the manufacturer. According to your information you have replaced the batteries 3 times in 5 years period. This is not normal. Nevertheless since the last replacement in 2008 it appears that the battery are now reaching the end life, which is generally 3-5 years life expectancy.

I would review the following of the assumption that the UPS is fully operational and the charging system is working.

1. Do a load test or a battery impedance test to verify the batteries are good
2. I would look at the battery life time specification, whether it is 3-5 years, 5-7 years ect.
3. Check the room temperature, every 10 degrees Celcius above 25 deg reduces battery life time by half
4. Check the number of power failures/ duration of these power failures and if possible what load were on the UPS at the time of the power failures.
I hope this will help. If all verifications are to specifications, then most likely it is a software problem

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2 Answers

Power inverter

hi you have two resens for this the first is your alternator is defective and your inverter can't not read the good isotope frequencies and the deep you lisent it's wrong isotope

the other one, you have two transistor attach to a cooler, these are scrap, this is those hoo create the isotope (hz) and hosting high ac current

so hi hope i help you bye

Sep 27, 2008 | Lenmar 1000W Power Inverter

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Broken LCD

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Although the performance of individual Plasma TVs can vary, overall, as a product class, a Plasma television can deliver many years of acceptable viewing.

Hope that helps........

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