Home 2nd Year Physics Notes Class 12 Physics Chapter 19 Short Questions and Numerical Notes- Dawn of Modern Physics

# Class 12 Physics Chapter 19 Short Questions and Numerical Notes- Dawn of Modern Physics

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In this post, I am sharing the Class 12 Physics Chapter 19 Short Questions and Numerical Notes PDF for the students of Intermediate Part 2. This chapter’s name is Dawn of Modern Physics. Students can download the Class 12 Physics Chapter 19 Short Questions and Numerical Notes PDF on their laptops or mobile. These Physics Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 2nd Year Physics Notes PDF chapters.

## FSC Part 2 Physics Chapter 19 Short Questions and Numerical Notes – Dawn of Modern Physics

Class 12 Physics Notes

#### What are the measurements on which two observers in relative motion will alwayas agree upon?

Two observers in relative motion will always agree that speed of light in free space is constant.

#### Does the dilation mean that time really passes more slowly in moving system or that it only seems to pass more slowly?

Time dilation is a real effect and time really passes slowly.

#### As a solid is heated and begins to glow, why does it first appear red?

We know that when a body is heated, it emits radiations. At low temperature, it emits radiations of longer wavelength. Since the longest visible wavelength is red, so it first appears red.

#### Does the brightness of a beam of light primarily depends on the frequency of photons or on the number of photons?

The brightness of intensity of a beam of light depends upon no. of photons not on the frequency the energy of photon depends upon the frequency.

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