Test 01/03

Try to give 7 (at least) correct answers in order to change level.

If you do not make it push the Refresh (or Reload) button to try again.

1. Which tribe made the first scientific thoughts?

The Ancient Egyptians
The Ancient Greeks
The Babylonians
The Ancient Chinese

2. Why Galileo failed to measure the speed of light?

Because he did not have the proper equipment
Because his measurements had not a "macroscopic" character
Because his measurements were not precise enough
Because he was occupied with other phenomena

3. Who was the scientist who backed the wave nature of light for first time?

C. Huygens
L. Euler
I. Newton
T. Young

4. What was the astonishing phenomenon which was observed and explained by the General Theory of Relativity?

The fact that phenomena cannot be assumed synchronous anymore
The fact we can see the light of more and more stars
The fact that light ban be bent by a gravity field
The fact that a black hole absorbs everything including light

5. What was the basic conclusion of the experiment of two slits?

We do not know when light acts like a wave and when like a particle
We can depict photons as firing guns
Electrons act similarly to photons
We know everything about light

6. An electron is following an orbit around a nucleus and absorbs a passing photon. What is more likely to happen?

Nothing. The electron will continue moving without being affected
It will be arised to a higher energy orbital
It will emit light
It will emit light and return to its previous orbit

7. In the electromegnetic spectrum, the visible radiation ...

Covers a tiny part of it
Is dangerous for the eyes
Is usually necessary to microwave ovens
"Stands" next to radiowaves

8. The phenomenon of total refraction imposes that:

The angle between the incident and the perpendicular ray of light to the surface is equal to the angle between the reflected and the perpendicular ray
The angle between the incident and the perpendicular ray of light to the surface is smaller to the angle between the reflected and the perpendicular ray
There is no reflected ray of light
There is no refracted ray of light

9. The basic colours...

Are the blue, the yellow and the red
Are the red, the green and the blue
And the additional ones give us the whole chromatic range
Are used during the printing process

10. Laser works when...

A quantity of photons is excited
A quantity of atoms is excited
When the energy of photons has a specific value
All of the above happen