Recent content by mike2007

Yes that is what it means, sorry about the mistake. Thank you very much for the clarification.

1/2*1/2*1/2 = 1/8 so there will be three half lives after 18 days. So therefore one half life is 6 days?

T1/2 = ln(2)/lambda Thats the formula i think will work.

If the rate of an isotope in 18 days has dropped by one eight of its initial value. what is the half life of the isotope? My answer In 18 days the rate has dropped by 1/8 so therefore the half life is 4/8 which is 18*4 = 72days

From the equation I would say the reaction is a chemical one.

If you light a match to a mixture of oxygen and hydrogen which then reacts explosively to form water. Is it a chemical or nuclear reaction? I know a chemical reaction is one in which a substance is changed into one or more new substances. A nuclear reaction is one in which a new element...

In chemical reactions the individual elements present in the reactants are the same as in the products of the reaction. Is this true for nuclear reaction? My attempt Nuclear reactants produce new products, and a new element can be made. This means that a new element with different proton and...

Is it possible for atoms of the same chemical element to have different chemical properties? My attempt Isotopes of an element differ from one another by the number of neutrons in the nucleus. They have same number of proton in the nuclei so they have the same chemical properties but not...

Can X rays be produced by a television picture tube? My attempt It is possible that X-rays can be produced by a television picture tube or a Cathode Ray tube because by altering the CRT X- rays may be produced. I have no idea if that is true but i think so.

heat turn iron to gold if heated?? Can Iron(Fe) be changed to gold(Au) if heated to a high enough temperature? My attempt Question 2 No, iron cannot be changed to gold by heating it to a high enough the temperature. Increasing the metal's temperature has no effect on the state.

A positive lens has a focal length of 12cm. An object is located a distance of 3 cm from the lens. How far is the lens from the image? Is the image real or virtual, erect or inverted? My attempt f = +12cm o = +3cm i =? 1/o + 1/I = 1/f 1/i = 1/f – 1/o = 1/12cm – 1/3cm = 1/12 – 4/12 =...

The formula is V = fגּ V = speed of light and will be constant for all waves so the frequency and wavelength will differ for the different type of waves.

For which of the following characteristics- speed, wavelength and frequency is light similar to microwaves, and for which does it differ? My attempt Light is similar to microwaves for speed and differs for wavelength and frequency. The speed of the waves are the same but the wavelengths of...

Thank you, clearer now

If the temperature of an organ pipe is increased above room temperature thereby increasing the speed of sound waves in the pipe but not affecting the length of the pipe significantly, what effect does this have in the frequency of the standing waves produced by the pipe? My attempt If the...