Question

+The. Edison. electric institute. has published: figures on the number of
kilowatt-hours-use-annually.by various home appliances. It is claimed that a:
vacuum cleaner-uses on average-of-46 kilowatt-hours.per year. 1
a). If.a.random sample of 40. homes.included in a planned.study indicates.
that. vacuum cleaners. use an average of 42 kilowatt. hours. Per year with
standard deviation of.11.9.kilowatt-hours.does this suggest at 0.05 level.of.
significant-that-vacuum cleaners-use, on average.46 kilowatt-hours.annually.
against the alternative.. 1
H1: less than 46 kilowatt-hours: 1​

Answer 1

Explanation:

73. In a young's double slit experiment, the

separation between the slits =2.0 mm, the

wavelength of the light =600 nm and the

distance of the screen from the slits =2.0 m. If

the intensity at the centre of the central

maximum is 0.20 Wm?, then the intensity at a

point 0.5 cm away from this centre along the

width of the fringe will be