Question

In a laboratory experiment on emission from atomic hydrogen in a discharge tube, only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. This is because in a laboratory
(a) the amount of hydrogen taken is much smaller than that present in the star
(b) the temperature of hydrogen is much smaller than that of the star
(c) the pressure of hydrogen is much smaller than that of the star
(d) the gravitational pull is much smaller than that in the star

Answer 1

Answer:

option b) the temperature of hydrogen is is much smaller than that of the stars

Answer 2

In a laboratory experiment on emission from atomic hydrogen in a discharge tube, only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. This is because in a laboratory the temperature of hydrogen is much smaller than that of the star

Explanation:

• The hydrogen atom usually excites based on the heat absorbed by them
• Usually, when the temperature is higher, The hydrogen spectrum can be seen with any number of lines whereas when the temperature is less, The hydrogen spectrum will produce less amount of lines .
• we know that the temperature of Star(Sun) is much higher than the temperature in the laboratory and Hence the small number of lines are observed in the lab than in star.