Home
Class 9
PHYSICS
A light pointer fixed to one prong of a ...

A light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating at a frequency of 56 Hz and allowed to free fall. Calculate how many complete oscillation are couhnted when plate falls st 10 cm

Text Solution

Verified by Experts

The correct Answer is:
8
Let `v=` frequency and `n =` number of oscillations.
Time taken to fall freely to a distance 10 cm.
`s = (1)/(2)"gt"^(2)`
`t = sqrt( ( 2 xx 10)/(g))`
The frequency of oscillation during this time
`v = (n)/(t) rArr n = v t`
`n = 56 xx sqrt((2 xx 10)/(980) ) = 7.999 ~~ 8`
Promotional Banner

Topper's Solved these Questions

  • SOUND

    MTG IIT JEE FOUNDATION|Exercise Olympiad/HOTS Corner|15 Videos

  • SOUND

    MTG IIT JEE FOUNDATION|Exercise Exercise (Subjective Problems) Long Answer Type|10 Videos

  • MOTION

    MTG IIT JEE FOUNDATION|Exercise Olympiad/HOTS Corner|21 Videos

  • THRUST AND PRESSURE

    MTG IIT JEE FOUNDATION|Exercise Olympiad/HOTS Corner|15 Videos

Similar Questions

Explore conceptually related problems

A light pointer fixed to one prong of a tuning fork touches gnetly a smoked vertical plate. The fork is set vibrating and the plate is allowed to fall freely. 8 complete oscilllations are counted when the plate falls through 10cm.What is the frequency of the tuning fork?

A light pointer fixed to one prong of a tuning fork touches gently a smoked vertical plate. The fork is set vibrating and the plate is allowed to fall freely. Two complete oscillations are traced when the plate falls through 40cm. What is the frequency ( in Hz ) of the tuning fork ?

A long tube contains air at a pressure of 1 atm and a temperature of 107^(@) C . The tube is open at one end and closed at the other by a movable piston. A tuning fork near the open end is vibrating with a frequency of 500 Hz . Resonance is produced when the piston is at distance 19 , 58.5 and 98 cm from the open end. The speed of sound at 10^(@) C is

A long tube contains air at a pressure of 1 atm and a temperature of 107^(@) C . The tube is open at one end and closed at the other by a movable piston. A tuning fork near the open end is vibrating with a frequency of 500 Hz . Resonance is produced when the piston is at distance 19 , 58.5 and 98 cm from the open end. The molar mass of air is 28.8 g//mol . The ratio of molar heat capacities at constant pressure and constant volume for air at this temperature is nearly

A string has linear mass density m = 0.1 kg // m . A L = 60 cm segment of the string is clamped at A and B and is kept under a tension of T = 160 N [The tension providing arrangement has not been shown in the figure]. A small paper rider is placed on the string at point R such that BR = 20 cm . The string is set into vibrations using a tuning fork of frequency f . (a) Calculate all values of f below 1000 Hz for which the rider will not vibrate at all. (b) Calculate all values of f below 1000 Hz for which the rider will have maximum oscillation amplitude among all points on the string.

A long tube contains air pressure of 1 atm and a temperature of 59^(@) C . The tube is open at one end and closed at the other by a movable piston . A tuning fork near the open end is vibrating with a frequency of 500 Hz . Resonance is produced when the piston is at distances 16 cm , 49.2 cm and 82.4 cm from open end. Molar mass of air is 28.8 g//mol . The speed of sound in air at 59^(@) C is

A long tube contains air pressure of 1 atm and a temperature of 59^(@) C . The tube is open at one end and closed at the other by a movable piston . A tuning fork near the open end is vibrating with a frequency of 500 Hz . Resonance is produced when the piston is at distances 16 cm , 49.2 cm and 82.4 cm from open end. Molar mass of air is 28.8 g//mol . Ratio of heat capacities at constant pressure and constant volume for air at 59^(@) C is

A long tube contains air pressure of 1 atm and a temperature of 59^(@) C . The tube is open at one end and closed at the other by a movable piston . A tuning fork near the open end is vibrating with a frequency of 500 Hz . Resonance is produced when the piston is at distances 16 cm , 49.2 cm and 82.4 cm from open end. Molar mass of air is 28.8 g//mol . Radius of tube is

The linear mass density of the string shown in the figure is mu = 1 g//m . One end (A) of the string is tied to a prong of a tuning fork and the other end carries a block of mass M. The length of the string between the tuning fork and the pulley is L = 2.0 m . When the tuning fork vibrates, the string resonates with it when mass M is either 16 kg or 25 kg. However, standing waves are not observed for any other value of M lying between 16 kg and 25 kg. Assume that end A of the string is practically at rest and calculate the frequency of the fork.