# If the de-Broglie wavelength of an electron is equal to 10−3 times the wavelength of a photon of frequency 6×1014 Hz, then the speed of electron is equal to : (Speed of light =3 ×108 m/s Planck’s constant=6.63×10−34 J.s Mass of electron =9.1×10−31 kg) (a) 1.45× m/s (b) 1.7×106 m/s (c) 1.8×106 m/s (d) 1.1 ×106 m/s

## Question ID - 50303 :- If the de-Broglie wavelength of an electron is equal to 10−3 times the wavelength of a photon of frequency 6×1014 Hz, then the speed of electron is equal to : (Speed of light =3 ×108 m/s Planck’s constant=6.63×10−34 J.s Mass of electron =9.1×10−31 kg) (a) 1.45× m/s (b) 1.7×106 m/s (c) 1.8×106 m/s (d) 1.1 ×106 m/s

1 Answer
5876 Votes
3537

Answer Key : (a) -

=10-3

v=

v=1.45×106 m/s

Next Question :
 A slob is subjected to two forces  and of same magnitude F as shown in the figure. Force  is in XY-plane while force F1acts along z-axis at the point (2+. The moment of these forces about point O will be : (a) (3−2−3)F (b) (3+2+3)F (c) (3+2+3)F (d) (3−2+3)F

View Topper Answer

We hope we have given the updated helpful answer / content for your query in an easily accessible format to help you in preparing adequately. We do offer free support materials, 10th maths guide, 10th science guide, 10th tamil guide, 10th social guide, 10th english guide, science 10th guide and also for all the classes books and guide to all the students who sign up for SaraNextGen. Apart from traditional textbook queries, we've got conjointly provided further high order level thinking issues, that are seemingly to be expected in boards and competitive exams. It includes conceptual queries, MCQs, Long and short answer type queries, etc. These Questions are designed to learn each student and academics by providing chapter-wise further issues focusing totally on testing conceptual information with applications. Here, we've got provided a number of the necessary ways in which within which the solutions of all the Questions will profit students of class 1 to 12. If you have any queries, drop a message to us and we will get back to you at the earliest.