MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Find out the wavenumber, when an electron jumps from 2nd orbit to 1st. |
| A. | 82357.75 cm-1 |
| B. | 105,677 cm-1 |
| C. | 82257.75 cm-1 |
| D. | 109,677 cm-1 |
| Answer» D. 109,677 cm-1 | |
| 2. |
When an electron jumps from 3rd orbit to 2nd orbit, which series of spectral lines are obtained? |
| A. | Balmer |
| B. | Lyman |
| C. | Paschen |
| D. | Brackett |
| Answer» B. Lyman | |
| 3. |
A metal’s work function is 3.8KJ. Photons strike metal’s surface with an energy of 5.2 KJ. what’s the kinetic energy of the emitted electrons? |
| A. | 3.8 KJ |
| B. | 5.2 KJ |
| C. | 9 KJ |
| D. | 1.4 KJ |
| Answer» E. | |
| 4. |
________ frequency, is the minimum frequency required to eject an electron when photons hit the metal surface. |
| A. | Required |
| B. | Activated |
| C. | Threshold |
| D. | Limiting |
| Answer» D. Limiting | |
| 5. |
What’s the wavelength for the visible region in electromagnetic radiation? |
| A. | 400 – 750 nm |
| B. | 400 – 750 mm |
| C. | 400 – 750 μm |
| D. | 400 – 750 pm |
| Answer» B. 400 – 750 mm | |