1
MHT CET 2021 23rd September Evening Shift
+1
-0

de-Broglie wavelength associated with an electron accelerated through a potential difference '$$\mathrm{V}$$' is '$$\lambda$$'. When the accelerating potential is increased to '$$4 \mathrm{~V}$$', de-Broglie wavelength.

A
reduces to half
B
remains the same
C
reduces to $$(1 / 4)^{\text {th }}$$
D
increases by $$25 \%$$
2
MHT CET 2021 23rd September Evening Shift
+1
-0

In photoelectric effect, the photo current

A
does not depend on the frequency of photon but depends on intensity of incident light.
B
decreases with Increase in frequency of incident photon.
C
increases with increase in frequency of incident photon.
D
depends with on intensity of incident radiation and its frequency.
3
MHT CET 2021 23rd September Evening Shift
+1
-0

According to de-Broglie hypothesis if an electron of mass '$$m$$' is accelerated by potential difference '$$V$$', the associated wavelength is '$$\lambda$$'. When a proton of mass '$$\mathrm{M}$$' is accelerated through potential difference $$9 \mathrm{~V}$$, then the wavelength associated with it is

A
$$\frac{\lambda}{3} \sqrt{\frac{\mathrm{m}}{\mathrm{M}}}$$
B
$$\frac{3}{2} \sqrt{\frac{m}{M}}$$
C
$$\frac{\lambda}{3} \sqrt{\frac{M}{m}}$$
D
$$\frac{3}{\lambda} \sqrt{\frac{\mathrm{M}}{\mathrm{m}}}$$
4
MHT CET 2021 23th September Morning Shift
+1
-0

When wavelength of incident radiation on the metal surface is reduced from '$$\lambda_1$$' to '$$\lambda_2$$', the kinetic energy of emitted photoelectrons is tripled. The work function of metal [$$\mathrm{h}=$$ Plank's constant, $$\mathrm{c}=$$ velocity of light]

A
$$\frac{\mathrm{hc}}{2}\left[\frac{3 \lambda_1-\lambda_2}{\lambda_1 \lambda_2}\right]$$
B
$$\frac{\mathrm{hc}}{2}\left[\frac{3 \lambda_2-\lambda_1}{\lambda_1 \lambda_2}\right]$$
C
hc $$\left[\frac{3 \lambda_1-\lambda_2}{\lambda_1 \lambda_2}\right]$$
D
hc $$\left[\frac{3 \lambda_2-\lambda_1}{\lambda_1 \lambda_2}\right]$$
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