HW - #14

[Alexa Marinelli-1B]

My prompt for #14 is: What would the speed of each particle be if it had the same wavelength as a photon of red light (lambda =750.0 nm)? I was able to calculate the first three speeds but I'm having difficulty figuring out the last one (alpha particle (mass=6.645×10−24 g)). I keep getting 1.3 x 10^-1. I'm not sure why this is wrong because I calculated it the same way I calculated the first three. I converted nm to m, g to kg, and used the formula v = h/mlambda. Please let me know if there is an obvious mistake I'm missing, thank you.

[Meghan Spoeri 2D]

Hi! I did the calculations and I got the same thing as you.

[Nico Towfighian 3L]

Make sure you are in putting all correct values into the equation and reading the problem statement, for example ur question says 750nm but mines says 450nm so double-check, so make sure you properly converted it to meters and properly converted it to kg.

you should be getting 6.626x10^-34 divided by (6.645×10−27 kg times 7.5x10^-7m)=velocity

[Alexa Marinelli-1B]

Make sure you are in putting all correct values into the equation and reading the problem statement, for example ur question says 750nm but mines says 450nm so double-check, so make sure you properly converted it to meters and properly converted it to kg.

you should be getting 6.626x10^-34 divided by (6.645×10−27 kg times 7.5x10^-7m)=velocity

Hi, thats the current set up that I have, which is giving me 1.3 x 10^-1 and I keep getting that its incorrect.

[Nico Towfighian 3L]

check how you are in putting that into your calculator, be careful with parentheses, and see if the final answer is asking for nm or just m

[Brianna Mercado 3D]

Hi! I also have the same set up & was wondering the same thing /:

[14b_student 2E]

I found my problem on this question to be parentheses. Be careful when entering them into your calculator especially when inputting the powers of 10.