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Q. If a simple pendulum is taken to the moon from the earth without changing the length, what is the effect on it's time period?
Ans: As the time period of a simple pendulum is inversely proportional to the square root of acceleration due to gravity and the acceleration due to gravity of the moon is less than that of the earth, time period increases (square root of 6 times)
Q: Why does a current carrying conductor placed in an magnetic field experiences force ?
Ans: Moving charges experience force in magnetic field. So when a current carrying conductor is placed in the magnetic field,it experiences force due to the force on moving charges inside it.
The formula F=IBLsin@, I= Current, B =external magnetic field
L is the length of conductor inside the magnetic field.
MAXIMUM FORCE
When the conductor is placed perpendicular to the magnetic field.
MINIMUM FORCE
When the conductor is placed parallel to the magnetic fields
Question: What are subjective and objective properties of sound ?
Answer : Subjective properties are basically the properties which can be measured directly. Loudness, pitch (shrillness) and quality(Timbre) of sound are subjective properties. But these properties are related to the the measurable quantities called objective properties.
Objective properties are the properties which can be measured. Intensity, Amplitude, frequency, wavelength, time period, intensity, fundamental frequency, subsidiary frequencies are objective properties.
Loudness depends on amplitude, intensity of the sound.
Pitch(shrillness) depends on frequency.
Quality (Timbre) depends on waveform( combination of primary and subsidiary notes).
QUESTION: Why is loud sound heard at RESONANCE?
ANSWER: Loud sound is heard at RESONANCE because amplitude increases when external frequency is equal or integral multiple of the natural frequency of vibrating body.
Islands or coastal areas enjoy moderate climate. Why?
Ans. Water has higher heat specific capacity than the land due to which there is the continuous formation of sea breeze and land breeze near the coastal areas. This keeps the temperature moderate.