Hence, its sensitive to both ultraviolet and infrared rays.
The infrared rays do cast shadows like visible rays as they are not able to pass through most opaque objects just like visible rays.
Now, we know that the energy of a electromagnetic wave is given by, $E =\frac{ hc }{\lambda}$
or, we can say that $E \propto \frac{1}{\lambda}$
Hence, if the wavelength decreases the energy will increase. Or, the lesser the wavelength the higher the energy. Infrared photons will have higher wavelength than that of visible light. Hence, its energy should be lesser than than visible light.
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$B$. The drift velocity is inversely proportional to the area of cross-section of given conductor.
$C$. The drift velocity does not depend on the applied potential difference to the conductor.
$D$. The drift velocity of electron is inversely proportional to the length of the conductor.
$E$. The drift velocity increases with the increase in the temperature of conductor.
Choose the correct answer from the options given below:
$(A)$ the current $I$ through the battery is $7.5 \mathrm{~mA}$
$(B)$ the potential difference across $R_{\mathrm{L}}$, is $18 \mathrm{~V}$
$(C)$ ratio of powers dissipated in $R_1$ and $R_2$ is $3$
$(D)$ if $R_1$ and $R_2$ are interchanged, magnitude of the power dissipated in $R_{\mathrm{L}}$ will decrease by a factor of $9$