17 th MARCH 2020
OBJECTIVES
1.IMAGE FORMATION-CONCAVE LENS
2.CALCULATION
REFER TEXT PAGE 159 AND WRITE THE ANSWERS
DO THE WORKSHEET GIVEN BELOW
ANSWERS I WILL UPLOAD LATER
TODAY S TOPIC VOICE MSG I WILL SEND THROUGH WHATS UP
QUESTIONS
1.List the properties of sound wave.
2.Define echo
3.Write the equation for measuring speed using echo method.
3.Write the equation for measuring speed using echo method.
REFER TEXT PG 134,135
SOLVE Q4) IN PAGE 135
SOLVE WORKSHEET Q2 USING ECHO METHOD.
APPLICATIONS OF ECHO SOUNDING
1.Echo-sounder
2.Radar
3.Parking sensor
4.Ultra sound scanning
MICROWAVES
4.If the body is exposed to microwaves they can cause internal heating of body tissue.
CHAPTER-2,ATOMIC PHYSICS
What is background radiation.?
There is a small amount of radiation around us all the time because of radioactive materials in the environment . This is called background radiation.
What is Alpha decay?
When a nucleus emits an alpha particle, it loses 4 nucleons and its mass number decreases by 4. It loses 2 protons and its atomic number decreases by 2.
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REVISION QUESTIONS
Define Gamma decay.
Gamma decay, type of radioactivity in which some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process. In the most common form of gamma decay, known as gamma emission, gamma rays (photons, or packets of electromagnetic energy, of extremely short wavelength) are radiated.
REVISION QUESTIONS-CLICK THE LINK BELOW
https://drive.google.com/open?id=1ro3ROoJJPH1uY8jYFk5jmKgIezdGojMA
Define half life.
The half life of a radioactive isotope is the time taken for the activity of any given sample to fall to half its original value.
Calculations
1.A radioactive sample has a half life of 8 hours.The activity is 800Bq.After how long will the activity be 100Bq.
Zoom online class-Radioactivity
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