Topic
Q:
A blue light has a 460 nm
wavelength. What is the
wavelength of the light in meters?
\( \left[\right. \) [?] \( \times 10^{[?]} \mathrm{m} \)
Q:
What is the wavelength of a
microwave with a frequency of
\[ \begin{array}{l}2.45 \times 10^{9} \mathrm{~Hz} \text { ? } \\ c=3.0 \times 10^{8} \mathrm{~m} / \mathrm{s}\end{array} \]
Q:
What is the frequency of
a red light with a wavelength
of \( 6.50 \times 10^{-7} \mathrm{~m} \) ?
\( [?] \times 10^{[?]} \mathrm{Hz} \)
\( c=3.0 \times 10^{8} \mathrm{~m} / \mathrm{s} \)
Q:
What is the frequency of
a red light with a wavelength
of \( 6.50 \times 10^{-7} \mathrm{~m} \) ?
\( [?] \times 10^{[6]} \mathrm{Hz} \)
\( c=3.0 \times 10^{8} \mathrm{~m} / \mathrm{s} \)
Q:
Which choice solves the equation
\( c=\lambda \cdot f \)
for frequency at the speed of light?
\( c= \) speed of light \( \quad \begin{array}{l}\lambda=\text { wavelength } \\ f=\text { frequency }\end{array} \)
\( f=\frac{\lambda}{c} \quad f=\frac{c}{\lambda} \)
Q:
(b) A different ray of light has an angle of incidence (i) of 48
The speed of light in air (c) is \( 3.0 \times 10^{8} \mathrm{~ms}^{-1} \).
The speed of light in glass \( (v) \) is \( 2.0 \times 10^{8} \mathrm{~ms}^{-1} \).
Calculate the angle of refraction \( (r) \) for this ray of light.
Q:
62 Date le grandezze \( A=(85,0 \pm 0,1) \mathrm{cm}, B=(42,6 \pm 0,1) \mathrm{cm} \) e
\( C=(22,0 \pm 0,1) \mathrm{m} \), calcola il volume \( V=A \cdot B \cdot C \), determi-
nane l'errore relativo e l'incertezza, arrotonda i risultati e
scrivi la misura.
Q:
Typical Exam Question:
A heating coil made from 11 metres of wire is connected to a 240
mains supply. The wire has diameter of 0.25 mm and resistivity
\( 1.0 \times 10^{-6} \Omega \mathrm{~m} \).
(a) Calculate its resistance
Q:
Which of the following situations is the most dangerous for humans?
Group of answer choices
A high voltage for a short time
A high current for a long time
A high current for a short time
A high voltage for a long time
Q:
If you plug an electric toaster rated at \( 110-\mathrm{V} \) into a \( 220-\mathrm{V} \) outlet, current in the toaster will be about
half what is should be.
more than twice what it should be.
twice what it should be.
the same as if it were plugged into \( 110-\mathrm{V} \).
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