The ultraviolet spectral region is obtained in Balmer series.

Is the following statement true about the Lyman spectral series? Statement Lyman series lies in the ultraviolet region

A

Statement is true

B

Statement is false

If the wavelength of the first line of the Balmer series in the hydrogen spectrum is $$\lambda $$, then the wavelength of the first line of the Lyman series is

A

$$\frac{{27}}{5}\lambda $$

B

$$\frac{5}{{27}}\lambda $$

C

$$\frac{{32}}{{27}}\lambda $$

D

$$\frac{{27}}{{32}}\lambda $$

Which of the following spectral series in hydrogen atom gives spectral line of 4860 Å?

A

Lyman

B

Balmer

C

Paschen

D

Brackett

RH রিডবার্গ ধ্রুবক হলে, হাইড্রোজেন বর্ণালির বামার সিরিজের ২য় লাইনের তরঙ্গদৈর্ঘ্য কত হবে? ( If RH is the Rydberg constant, what will be the wavelength of the 2nd line in the Balmer series of hydrogen spectrum?)

A

36RH5

B

163RH

C

3RH16

D

536RH

Who discovered the Balmer formula for a series of hydrogen emission lines?

A

Russell-Saunders

B

Johannes Rydberg

C

Johann Balmer

D

Walter Ritz

Which of the following will be the longest wavelength in Balmer series of hydrogen atom?

A

2300 Å

B

1215 Å

C

4800 Å

D

6557 Å

With reference to the movement of molecules of fluid in plant, consider the following statements.
1. Diffusion is the movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration.
2. Osmosis is a process in which the water molecules move through a semipermeable membrane from the region of their lower concentration to the region of their higher concentration.
Which of the statement(s) given above is/are correct ?

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 nor 2

Which of the following statements are correct?
1. During the period of the fetus actual growth and development is greater than during the period of embryo.
2. During the period of the embryo and fetus growth follows law of developmental direction.
3. Towards the end of the period of the fetus the amount of activity in the leg region is similar to that of the head region.
4. Muscles in the head region comeunder voluntary control first and those in the leg region later.
Select the correct answer

A

1, 2, 3 and 4

B

1, 2 and 3

C

1 and 2

D

1 and 4

The optical source used in a fiber is an injection laser with a relative spectral width σλ/λ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.

A

1.2 nm

B

1.3 nm

C

0.77 nm

D

0.98 nm

Let x(t) be a wide sense stationary (WSS) random with power spectral density S_x(f). If Y(t) is the process defined as y(t) = x(2t - 1), the power spectral density S_Y(f) is

A

$${S_Y}\left( f \right) = {1 \over 2}{S_X}\left( {{f \over 2}} \right){e^{ - j\pi t}}$$

B

$${S_Y}\left( f \right) = {1 \over 2}{S_X}\left( {{f \over 2}} \right){e^{ - {{j\pi t} \over 2}}}$$

C

$${S_Y}\left( f \right) = {1 \over 2}{S_X}\left( {{f \over 2}} \right)$$

D

$${S_Y}\left( f \right) = {1 \over 2}{S_X}\left( {{f \over 2}} \right){e^{j2\pi f}}$$