1
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

In which of the following photoelectric effect is not observed?

A
Potassium
B
Rubidium
C
Magnesium
D
Cesium
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

Light of wavelength $$\lambda$$ strikes a photoelectric surface and electrons are ejected with kinetic energy $$K$$. If $$K$$ is to be increased to exactly twice its original value, the wavelength must be changed to $$\lambda^{\prime}$$, such that

A
$$\lambda^{\prime}<\lambda / 2$$
B
$$\lambda^{\prime}>\lambda / 2$$
C
$$\lambda>\lambda^{\prime}>\frac{\lambda}{2}$$
D
$$\lambda^{\prime}=\frac{\lambda}{2}$$
3
VITEEE 2021
MCQ (Single Correct Answer)
+1
-0

Einstein's photoelectric equation is

A
$$E_{\max }=h v-\phi$$
B
$$E=m c^2$$
C
$$E^2=p^2 c^2+m_0^2 c^4$$
D
$$E=\left(\frac{1}{2}\right) m v^2$$
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