Answer:
Explanation:
We can use the relation
Q =mcΔθ
to find the energy required to heat the iron nail, where Q is the heat energy required, m is the mass of the nail and Δθ is change in temperature and c is heat capacity of the iron nail.
Also, from the question,
c = 0.4494J/g°C
Δθ=720 - 65 = 655°C
By substitution
Hence the energy required to heat the iron nail is 7506.1035J
Answer:
Green, blue, indigo and violet.
Explanation:
The velocity of a wave is given by
where
f = Frequency =
= Wavelength
The wavelength of the wave is 550.459 nm
Green light has wavelength which ranges from 500-565 nm.
So, the light which observed is green light and lower in wavelength than green light i.e., green, blue, indigo and violet.
Answer:
(a) nearsighted
(b) diverging
(c) the lens strength in diopters is 1.33 D, and considering the convention for divergent lenses normally prescribed as: -1 33 D
Explanation:
(a) The person is nearsighted because he/she cannot see objects at distances larger than 75 cm.
(b) the type of correcting lens has to be such that it counteracts the excessive converging power of the eye of the person, so the lens has to be diverging (which by the way carries by convention a negative focal length)
(c) the absolute value of the focal length (f) is given by the formula:
So it would normally be written with a negative signs in front indicating a divergent lens.