Recent content by carus88

Thank you for your help.

sorry bout the multiple post i don't know how to delete the other one? i used : 1. lambda=h/p=h/mv an got v to = 1.98x10^3 m/s then used ke = 0.5mv^2 = 0.0205eV are these answers correct? i attampted the the 2nd part and worked out a percentage based on the respective energies...

Calculate the velocity and kinetic energy of a neutron (mass 1.675x10-27kg) that has a wavelength of 0.2nm. How does this compare to the average kinetic energy of a gas molecule at room temperature (0.038eV at 200C)? 1. E=mc^2 2. KE = 1/2 mv^2 I used 1. to calculate the energy which was...

so pi x 0.5^2 ?

An elastic conducting material is stretched into a horizontal circular loop of radius 20 cm and placed in a magnetic field of strength 0.5 T, directed vertically downwards. a. What is the magnetic flux through the loop? b. When released, the radius of the loop decreases at an initial rate...

A copper wire is carrying a current of 1 mA. How many electrons pass a point in the wire in one minute? If the radius of the wire is 1 mm, calculate the magnitude of the current density. Given that the number of conduction electrons in copper is 8.47 × 10^28 m-3, what is the drift speed of the...

The earth’s electric field is measured at a height of 200 m and is found to be directed vertically downwards and to have a strength of 100 Vm1. At a height of 300 m, the direction of the field is found to be the same, but the field’s strength has decreased to 60 Vm1. Use Gauss’ law to...

thank you so much!

so i use the work funct equation an work backwards to get the threshold freq an then the cut off wavelength? and for the min KE use the threshold freq?

'light of wavelength 180nm falls on an aluminium surface. the work funct is 4.2eV. what is the KE of the fastest and slowest emmited photoelectrons? Also the cutoff wavelength for the Aluminium? i only need the right equations an a little guidance as i myt as well be a complete novice. i have...

but its considered weak now (ie in relation to the start of the universe) only because of common observation processes by which it seems like it is. is it weak because of the the particles mass?

Why is it called the 'weak force'? what makes it weak?