## Physics GRE 1777 Solutions

mohamedabdelhafez
Posts: 2
Joined: Tue Aug 08, 2017 9:33 pm

### Physics GRE 1777 Solutions

Hello everyone!

I hope you are all doing well! This is Mohamed Abdelhafez, a physics grad student @ the University of Chicago. As ETS recently released a new physics GRE test (GR1777) https://www.ets.org/s/gre/pdf/practice_book_physics.pdf, I have written down full solutions for it as part of a course I was teaching and you can find them here : http://home.uchicago.edu/~abdelhafez/pgre.php

I decided to share them as a tribute to this site and fellow sites that helped me a lot in my applications!

Please let me know if you have any comments/corrections, and best of luck to all of you who are starting this long journey of applying to physics PhD! Also, feel free to send me questions you have regarding grad life etc.

Mohamed

MohamedIBrahim
Posts: 1
Joined: Thu Dec 08, 2016 8:36 am

### Re: Physics GRE 1777 Solutions

mohamedabdelhafez
Posts: 2
Joined: Tue Aug 08, 2017 9:33 pm

### Re: Physics GRE 1777 Solutions

Dear all,

Qwaps
Posts: 36
Joined: Mon Mar 14, 2016 9:21 am

### Re: Physics GRE 1777 Solutions

I saw question 100 on the PGRE I took in April 2016. Such a fun question to finish the exam with

Darrinallen
Posts: 5
Joined: Wed Jul 18, 2018 12:09 am

### Re: Physics GRE 1777 Solutions

Thanks for solutions. I am assuming this gr1777 exam is very representative of the actual exam

phy94
Posts: 5
Joined: Sun Mar 04, 2018 5:10 am

### Re: Physics GRE 1777 Solutions

Can someone confirm the answer to question 100?

pinchun
Posts: 1
Joined: Fri Oct 26, 2018 12:16 am

### Re: Physics GRE 1777 Solutions

I think the rms deviation of Prob.41 should be coming from
the binomial error, which is sqrt(N*p*(1-p)) = sqrt(100*0.1*0.9) = sqrt(9) = 3 rather
than sqrt(10), since this is a detect-or-not problem and should follow binomial
distribution rather than Poisson. Thanks!