1
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Ratio of longest wavelength corresponding to Lyman and Balmer series in hydrogen spectrum is

A
$$\frac{7}{29}$$
B
$$\frac{9}{31}$$
C
$$\frac{5}{27}$$
D
$$\frac{3}{23}$$
2
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Half life of radio-active element is 1600 years. The fraction of sample remains undecayed after 6400 years will be

A
$$\frac{1}{16}$$
B
$$\frac{1}{4}$$
C
$$\frac{1}{8}$$
D
$$\frac{1}{24}$$
3
MHT CET 2023 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Frequency of the series limit of Balmer series of hydrogen atom in terms of Rydberg's constant (R) and velocity of light (c) is

A
$$4 \mathrm{Rc}$$
B
$$\frac{4}{\mathrm{Rc}}$$
C
$$\mathrm{Rc}$$
D
$$\frac{\mathrm{Rc}}{4}$$
4
MHT CET 2023 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the radius of the first Bohr orbit is '$$r$$' then the de-Broglie wavelength of the electron in the $$4^{\text {th }}$$ orbit will be

A
$$4 \pi \mathrm{r}$$
B
$$6 \pi \mathrm{r}$$
C
$$8 \pi \mathrm{r}$$
D
$$\frac{\pi r}{4}$$
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