A wall clock has a second hand 22.0 cmcm long. For related problem-solving tips and strategies, you may want to view a Video Tut
1 answer:
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Answer:
<h3>(A) The widthExplanation:
Given :
Focal length
Maximum aperture
Wavelength m
(A)
From rayleigh criterion,
rad
From angle formula,
Where 12 m ( given in example )
m
m
(B)
We know that is proportional to the
and inversely proportional to the
so we write the new width, here is 5.5 times larger than above case
m
Answer:
Option (A) is correct.
Explanation:
A horizontal rope has a length of 5 m and a mass of 0.00145 kg. If a pulse occurs on this string, generating a wavelength of 0.6 m and a frequency of 120 Hz. The tension to which the string is subjected is
mass of string, m = 0.00145 kg
Frequency, f = 120 Hz
wavelength = 0.6 m
Speed = frequency x wavelength
speed = 120 x 0.6 = 72 m/s
Let the tension is T.
Use the formula
Option (A) is correct.