Dhwani Visariya − Profile

i. The phenomenon involved in tuning a radio set to a particular station is resonance. ii. Resonance is the phenomenon in which a system responds with maximum amplitude to an external driving force that matches the system's natural frequency of vibration. iii. Loudness of sound is the subjective perception of the intensity or amplitude of a sound wave. It is related to the amount of energy carried by the sound wave and how it is perceived by the human ear. iv. The loudness of sound is measured in units called decibels (dB).

Ascending order of penetrating power: α (alpha), β (beta), γ (gamma) Alpha particles have the least penetrating power, followed by beta particles, while gamma rays have the highest penetrating power.

Ascending order of ionizing power: γ (gamma), β (beta), α (alpha) Gamma rays have the least ionizing power, followed by beta particles, while alpha particles have the highest ionizing power.

To find the distance of the other cliff: Time between first and second echo = 2 s Speed of sound (calculated earlier) = 320 m/s Distance sound travels in 2 s = Speed × Time = 320 m/s × 2 s = 640 m This distance represents the difference in the round trip distances to the two cliffs. Let x be the distance to the second cliff. 2x - 2(480) = 640 2x = 1600 x = 800 m The distance of the other cliff from the person is 800 m.

To calculate the speed of sound: Distance to nearest cliff = 480 m Time for first echo = 3 s The sound travels to the cliff and back, so the total distance is twice the distance to the cliff. Total distance = 2 × 480 m = 960 m Speed of sound = Distance / Time Speed of sound = 960 m / 3 s = 320 m/s

The power developed by the two men will be different. Power is the rate of doing work, calculated as work done divided by time taken. For the first man (assuming he lifts the box quickly, let's say in 2 seconds): Power = Work / Time = 980 J / 2 s = 490 W For the second man: Power = Work / Time = 980 J / (5 × 60 s) = 3.27 W The first man develops significantly more power than the second man because he performs the same amount of work in a much shorter time.

The work done by both men is the same. Work done is calculated as the product of force and displacement in the direction of the force. In this case: Work = Force × Height Work = (Mass × Acceleration due to gravity) × Height Work = (50 kg × 9.8 m/s²) × 2 m Work = 980 J The work done is independent of the time taken to lift the box. Both men do the same amount of work, 980 J, regardless of how long it takes them to lift the box.

The magnitudes of centripetal and centrifugal force are equal but opposite in direction. In a rotating reference frame, the centrifugal force appears to balance the centripetal force, creating the illusion of equilibrium. However, it's important to note that centrifugal force is not a real force, while centripetal force is a real force acting on the object in circular motion.

No, centrifugal force is not the force of reaction of centripetal force. Centrifugal force is actually a fictitious or apparent force that appears to act outward on a body moving in a circular path, arising from the body's inertia. It is not a real force but rather an effect observed in a rotating reference frame. The actual force acting on the body is the centripetal force, which is directed towards the center of the circular path.

With reference to the direction of action: Centripetal force: - Acts towards the center of the circular path - Is a real force that causes the object to move in a circular path - Examples include tension in a string for a swinging object or gravitational force for orbiting planets Centrifugal force: - Appears to act away from the center of the circular path - Is a fictitious or apparent force, only experienced in the rotating frame of reference - Not a real force, but rather the inertia of the object resisting the change in direction The key difference is that centripetal force is an actual force acting inward, while centrifugal force is an apparent force felt outward due to the object's inertia in the rotating frame.