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Ask Physics-related questions here!
Why should resonance be avoided in some cases and how it be done?
Resonance will produce maximum amplite of oscillation which may cause disintegration of the oscillation system.
Resonance can be avoided by adjusting the natural frequency of the oscillatiing system to be far away from the driving frequency
Can help me to give 3 practical examples of forced oscillations and resonance.
Example 1 : Microwaves oven – microwaves will cause the water molecules in the food to vibrate.
If the frequency of the microwave is the same as the natural frequency of the water molecules,
resonance occurs and the water molecules will vibrate with max amplitude, hence heating up the food.
Example 2 : Vibrating of a glass by using a vibrator. Sound wave from the vibrator will cause the glass molecules in the glass
to vibrate. If the frequency of vibration is the same as the natural frequency of the glass goblet, resonance occurs and the glass structure will
vibraite with maximum amplitude, hence glass break.
Example 3 : A note produced by a musical instrument. Eg plucking of a guiter string produces a dominant sound or note whose
frequency is the same as the natural frequency of the vibrating string. Hence the string will break
How to distinguish between emission and absorption spectra?
An emission line spectrum of an element consists of colored lines on dark background.
While an absorption spectrum consists of dark lines on colored background, at the same discret wavelength positions for the same element.
For emission spectra, electrons transit from higher energy level to lower energy level.
For absorption spectra, electrons transit from lower energy level to higher energy level.
Can u help me to explain why geostationary satellite must be above the equator?
The gravitational force by the Earth on the satellite is directed towards the centre of the Earth.
The centripetal force is directed towards the centre of the orbit.
For any satellite, the centre of the orbit must be the centre of the Earth.
In order for the satellite to appear stationary when observed from the Earth,
the axis of rotation of the satellite must be the same as the axlis of rotation of the Earth.
Hence geostationary satellite must be above the equator
What is the difference between elastic and inelastic collision?
I have a question in superposition. Why sometime n*wavelength is constructive and sometime is destructive interference.
When the transmit sources are in phase then use n*wavelength for constructive interference. When the transmit sources are out of phase then use n*wavelength for destructive interference.
can u give me a copy of Alevel papers? thank u!!!
Hi Tung which year?
Hi Mr Ong, can you send me Physic Alevel paper: 2007 & 2008 &answers.
Thanks!
Hi Zen Zen, soln sent
Mr ong, can you help me print the physics planning notes for paper 2? Thanks
Hello
Hi, Mr Ong. For phy p3, which topic we should focus now