# [J2] Lesson 19 (11 – 17 May) Updates/ Debrief

[J2 Physics PMCians] Seeing Through X-Rays!!

What we did in 2 hours:

We expanded our understanding about energy levels and spectral emissions to X-RAYS!

How do we generate X-rays on demand?

Why do the rays have specific characteristic spectral lines?

And lastly, how do we control the energy and frequency of the X-rays we produce?

All those questions and more were answered in our last LIVE tutorial!

What you take home:

1) X-Ray Test E – Chat Challenge (solutions)

https://tinyurl.com/yb8xmysq

2) Line Spectra & X-Ray 4Q Test F – Breakout Room Challenge (solutions)

https://tinyurl.com/y7lysvw8

Special Mention:

Our next lesson will be our final installment of Quantum Physics. In the upcoming lesson, we will explore deBroglie’s hypothesis for Wave-Particle Duality and the renowned Heisenberg’s Uncertainty Principle

Looking forward to seeing you soon! Stay healthy and strong! 🙂

[J2 Maths PMCians]

What we did in 2 hours:

We finished Normal Distribution, covering questions involving a wide variety of operations. Additionally, we started on the Sample Mean Distribution, picking up how to approximate sample sums and sample means as normal distributions, when the sample size is sufficiently large.

Also, we kicked off our Pure Math revision with the first of our extra lessons on Sequences & Series. Having started using our Secrets Enclosed, do get familiar with it and improve on it with your own annotations, making it a powerful and personal resource for yourself!

What you take home:

The worked solutions for our Sequences & Series extra lesson is linked here:

https://tinyurl.com/ycalsajs

Special Mention:

This week, will will covered questions on Sample Mean distribution, involving approximations and operations from the earlier chapters, Binomial Distribution and Discrete Random Variables.

Do also warm up for our next Extra Lesson on Vectors, which will be on next Tuesday (19th May) at 10 am.

See You (online) and Stay Healthy!

[J2 Chemistry PMCians]

What we did in 2 hours:

This week, we focused on the (in)solubility of ionic compounds. One can see a saturated solution of a sparingly soluble salt as an equilibrium, and equilibrium concepts can be extended to the case of solubility. The bulk of the lesson focuses on the calculations, which will turn out to be one of the hardest in H2 Chem. Do make an effort to clarify if you have made calculation errors to clarify concepts.

What you take home:

The solutions to Everything you need to know series and selected structured questions are found here:

https://tinyurl.com/ycfbjgz5

Special Mention:

In the upcoming week, we will complete Electrochemistry, dealing with both electrochemical cells as well as electrolytic cells.

Stay healthy and strong!

Mr Leong

Home-Based Learning (HBL)

1) One Weekly PMC Lecture Webcast (www.pmc.sg/lecture)

2) One Weekly PMC LIVE Tutorial (www.pmc.sg/live)