MHT-CET

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Q1.

Electrons of mass $m$ with de-Broglie wavelength $\lambda$ fall on a target. The cut-off wavelength $\lambda_0$ is equal to [$h=$ Planck's constant,$c=$ velocity of light].

(A)

$\frac{2 m c \lambda^2}{h}$

(B)

$\frac{m c \lambda}{h}$

(C)

$\frac{2 h}{m c \lambda^2}$

(D)

$\frac{2 m c \lambda}{h}$

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Q2.

If an electron in a hydrogen atom jumps from an orbit of level $n=3$ to an orbit of level $n=2$,the emitted radiation has a frequency ($R=$ Rydberg constant,$C=$ velocity of light).

(A)

$\frac{3RC}{27}$

(B)

$\frac{RC}{25}$

(C)

$\frac{8RC}{9}$

(D)

$\frac{5RC}{36}$

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