A Jiffy The American physical chemist Gilbert Newton Lewis (1875–1946) proposed a unit of time called the “jiffy

9780321541635
mastering-physics

#1

A Jiffy The American physical chemist Gilbert Newton Lewis (1875–1946) proposed a unit of time called the “jiffy.”According to Lewis, 1 jiffy = the time it takes light to travel one centimeter, (a) If you perform a task in a jiffy, how long has it taken in seconds? (b) How many jiffya are in one minute? (Use the fact that the speed of light is approximately 2.9979 x 108 m/s.)

Answer:

CONCEPT:
The new unit proposed for time by the physical chemist is called as “jiffy”. It is equal to the time taken by light to travel a distance of 1 cm.
The relation for time taken in terms of distance and speed is
image
Here, d is distance and v is speed.

SOLUTION:
(a) The time taken by the task is measured in seconds as follows.
Convert the unit jiffy into seconds.
image
Therefore, the time taken by the task is measured in seconds is image

(b) The number of jiffys in minute is calculated as follows.
image
Therefore, the number of jiffys in minute is image