Muhammad Haider

Other Schools
STEM Student

Biography

I have recently completed my Masters in Physics from Kings College London. Physics can be a challenging subject, especially when one tries to learn new concepts alone. Throughout the degree, I have often adopted a heuristic approach to tackling the most challenging of concepts. Using the "Feynman technique", I have helped to elucidate my own difficulties and those of my peers.

For the past two years I have also served on the Student Staff Liaison Committee - serving as one of two elected representatives whom provide feedback from students to senior staff in quarterly meetings.

Education

MS Physics
Other Schools

Educator Statistics

Numerade tutor for 5 years
21 Students Helped

Topics Covered

Master the Fundamentals of Physics: Learn Physics Basics
Mastering Motion: Achieving Efficiency Along a Straight Line
Discovering the Fundamentals: Newton's Laws of Motion Explained
Mastering Newton's Laws: Tips for Applying Them Effectively
Discover the Fascinating World of Particle Physics Today

Muhammad's Textbook Answer Videos

02:53
An Introduction to Modern Astrophysics

Taking the distance to the Crab to be $2000 \mathrm{pc}$, and assuming that the absolute bolometric magnitude at maximum brightness was characteristic of a Type II supernova, estimate its peak apparent magnitude. Compare this to the maximum brightness of the planet Venus $(m \simeq-4)$ which is sometimes visible in the daytime.

Chapter 15: The Fate of Massive Stars
Muhammad Haider
06:22
An Introduction to Modern Astrophysics

(a) Assuming that the light curve of a supernova is dominated by the energy released in the radioactive decay of an isotope that has a decay constant of $\lambda$, show that the slope of the light curve is given by Eq. (11).
(b) Prove that Eq. (12) follows from Eq. (11).
$$\frac{d \log _{10} L}{d t}=-0.434 \lambda$$ or $$\frac{d M_{\mathrm{bol}}}{d t}=1.086 \lambda.$$

Chapter 15: The Fate of Massive Stars
Muhammad Haider
01:48
An Introduction to Modern Astrophysics

If the linear decline of a supernova light curve is powered by the radioactive decay of the ejecta, find the rate of decline (in $\operatorname{mag} \mathrm{d}^{-1}$ ) produced by the decay of $_{27}^{56} \mathrm{Co} \rightarrow_{26}^{56} \mathrm{Fe},$ with a half-life of 77.7 days.

Chapter 15: The Fate of Massive Stars
Muhammad Haider
08:51
An Introduction to Modern Astrophysics

The energy released during the decay of one $\frac{56}{27}$ Co atom is $3.72 \mathrm{MeV}$. If $0.075 \mathrm{M}_{\odot}$ of cobalt was produced by the decay of $_{28}^{56} \mathrm{Ni}$ in $\mathrm{SN} 1987 \mathrm{A}$, estimate the amount of energy released per second through the radioactive decay of cobalt
(a) just after the formation of the cobalt
(b) one year after the explosion.
(c) Compare your answers with the light curve of SN 1987A given in Fig. 12.

Chapter 15: The Fate of Massive Stars
Muhammad Haider
03:44
An Introduction to Modern Astrophysics

The neutrino flux from SN 1987 A was estimated to be $1.3 \times 10^{14} \mathrm{m}^{-2}$ at the location of Earth. If the average energy per neutrino was approximately $4.2 \mathrm{MeV}$, estimate the amount of energy released via neutrinos during the supernova explosion.

Chapter 15: The Fate of Massive Stars
Muhammad Haider
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